Mechanical Engineering, Mechanics of Materials, Materials Science, Polymers and Plastics
14
Scopus Publications
870
Scholar Citations
11
Scholar h-index
11
Scholar i10-index
Scopus Publications
Experimental characterization and numerical investigation on different conformal lattice structures for specific energy absorption under quasi-static and dynamic loading Calpana R, Dara Ashok, Prasanna A, SR Kasireddy, MVA Raju Bahubalendruni International Journal of Protective Structures, 2025 Lattice structures exhibit significant potential for superior energy absorption under both static and dynamic loading conditions when compared to solid infill designs. This advantage arises from their distinctive properties, including low relative density, high flexibility, and enhanced compressibility. In this study, a novel type of infill lattice structure, termed the Different Conformal Lattice Structure (DCLS), was developed. DCLS is constructed through the tessellation of Simple Cubic (SC), Body-Centered Cubic (BCC), and Face-Centered Cubic (FCC) lattice configurations. The lattice structures were designed using Fusion360, incorporating optimized infill geometries characterized by both constant and variable relative densities achieved by varying the strut diameters of the individual lattices. Fabrication was performed using the Stereolithography (SLA) process, and the structures were subjected to quasi-static compression testing on a dynamic universal testing machine. Additionally, dynamic characterization was conducted using a Split Hopkinson Pressure Bar (SHPB) apparatus, and the results were compared with finite element simulations. The Experimental findings revealed that specific DCLS configurations, particularly EVT-BFS-2.5, demonstrated exceptional performance, achieving the highest specific energy absorption (SEA) values, exceeding 28 MPa under dynamic loading. This represents an impressive 1866.97% increase compared to quasi-static testing. Finite element analysis corroborated these experimental results, showing excellent agreement and validating the accuracy of the simulations. The study underscores the potential of DCLS with optimized tessellation patterns to significantly enhance energy absorption capabilities. These findings position DCLS as a promising solution for applications demanding lightweight, high-performance energy-dissipative materials.
Experimental and numerical investigation on 2.5-dimensional nature-inspired infill structures under out-plane quasi-static loading Dara Ashok, M V A Raju Bahubalendruni, Atharva Mhaskar, Vishal Choudhary, Gunji Balamurali, Shesahiah Turaka Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering, 2025 The 2.5-dimensional (2.5D) infill structures are gaining more attention due to their better energy absorption capabilities and lightweight. The additive manufacturing eases the fabrication of these structures and made them accessible for industrial and transport applications. The present work is focused on enhancing energy absorption capability, and mean crush force (MCF) for a novel nature-inspired 2.5D infilled structure through nature-inspired 2.5D geometries. Six nature-inspired geometries are considered for a comparative analysis with the proposed novel snowflake-inspired 2.5D infilled structure to sustain under quasi-static out-plane loading. These structures are cylindrical shells filled with different infill configurations and maintained at constant volume. The structures are fabricated using three-dimensional printing through the digital light processing technique with photopolymer resin and tested under compressive out-plane quasi-static loading conditions. Numerical simulations were performed by ANSYS and compared with experimental results to corroborate the reliability. The effect of infill configurations and supported ribs on the crushing behaviour is discussed in detail. The results reveal a significant improvement in MCF, specific energy absorption, and confined crushing deformation for the proposed lightweight 2.5D infill structures.
Quasi-static and dynamic response of open lattice structures for enhanced plateau stresses: Simulation and experiment validation Ashok Dara, Johnney Mertens A, Balamurali Gunji, M.V.A. Raju Bahubalendruni Materials Today Communications, 2025 Lattice structures have gained significant attention due to their lightweight properties and exceptional capacity for specific energy absorption (SEA). This study focuses on designing a nature-inspired novel open flower lattice structure (NINOFL) to improve plateau stress and SEA under quasi-static and dynamic loading conditions . Multiple variations of NINOFL structures were designed and fabricated using the powder bed fusion (PBF) additive manufacturing (AM) process with SS316L material. The structures were developed in three-layered patterns within a 30 mm cubic framework, maintaining a consistent relative density of approximately 21 ± 1 %. To characterize the fabricated structures, Scanning Electron Microscopy (SEM) analyses were conducted to assess material distribution and identify potential defects arising from the AM process. Mechanical performance was evaluated through quasi-static compression tests using a universal testing machine (Instron 8801) and dynamic compression tests employing a Split Hopkinson Pressure Bar (SHPB) across varied high strain rates . Finite Element (FE) Analysis simulations performed with ANSYS software provided insights into the deformation mechanisms of the multi-layered structures under compression. The performance of the NINOFL structures was compared against standard Honeycomb (HC) and merged tessellated open-type lattice structures (MTLs) of similar relative density. Results demonstrated that the NINOFL structures outperformed their counterparts, exhibiting superior plateau stress distribution and significantly enhanced SEA. These findings establish the proposed NINOFL design as a promising solution for applications requiring optimized energy absorption and load-bearing capabilities.
Characterization of penetrate and interpenetrate tessellated cellular lattice structures for energy absorption Ashok Dara, A Johnney Mertens, M V A Raju Bahubalendruni Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications, 2023 Recently, cellular lattice structures are gaining research attention due to their lightweight and high energy absorption. Interpenetrated lattice structure is a combination of two or more regular lattices with the same volume and without any contact at the unit level. The interpenetrated tessellated lattice (I-PTL) structures are better known for load sharing and energy absorption applications. In the current research, regular unit cell lattices such as cubic, beam lattice, body-centered cubic, and octahedron are considered to fabricate penetrated and interpenetrated cellular lattice structures and tested for energy absorption on quasi-static loading. These structures were fabricated using a Vat polymerization three-dimensional printer and tested as per the American Society for Testing and Materials (ASTM) standards, and the results were compared with numerical simulation using ANSYS. The penetrated tessellated lattice structural and I-PTL behavior deliver energy transfer controlled by the surface and solid joint interactions. The enhancement in mechanical properties is observed with the controllable compliance and specific energy absorption of the lattice structure.
Design and Characterization of 2.5D Nature-Inspired Infill Structures under Out-Plane Quasi-Static Loading Condition Dara Ashok, M. V. A. Raju Bahubalendruni Advances in Materials Science and Engineering, 2023 The 2.5D (2.5-dimensional) structures are acquired to enhance safety and lightweight designs with better energy absorption in the aerospace and automobile sectors. Additive manufacturing (AM), which is practical to build suitable components in industrial and transportation applications, may produce these structures more efficiently. The current study aims to improve the 2.5D infilled structures mean crush force (MCF) and energy absorption capabilities. Under compression loading, the proposed novel nature-inspired 2.5D infilled structure is compared to six existing 2.5D geometries that are inspired by nature. These structures are made of cylindrical shells that are filled with various infill configurations and maintained at a consistent volume. Photopolymer resin is used as the material for the structures, which are created using a digital light processing (DLP) method under AM technology. The characterization of the constructed models was done under compressive out-plane quasi-static stress conditions. ANSYS numerical simulations have been carried out to confirm the dependability of experimental data. The impact of supporting ribs and infill designs on crushing behaviour is thoroughly discussed. Mean crush force (MCF) and specific energy absorption (SEA) under quasi-static compression loading are provided to the proposed unique nature-inspired 2.5D infilled structure to significantly boost crushing qualities, axial collapse, and energy absorption behaviours.
A novel nature inspired 3D open lattice structure for specific energy absorption Dara Ashok, M. V. A. Raju Bahubalendruni, A. Johnney Mertens, Gunji Balamurali Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering, 2022 Energy absorption is a key performance criterion for several engineering structures. Lightweight lattice structures are better suited for this purpose. The convolute design patterns that exist in nature are proven effective for several engineering applications. In this paper, a George lily flower leaf is considered to build a novel 3D open lattice pattern for specific energy absorption (SEA) purposes. A multi-cellular specimen is designed and fabricated using Vat photopolymerization 3D printing process. Quasi-static compression tests have been conducted and the performance of proposed structure is compared with 2.5D closed thin-walled structures and found the proposed 3D open lattice structure has shown significant improvement in SEA over other thin-walled structures.
Challenges and opportunities in human robot collaboration context of Industry 4.0 - a state of the art review Anil Kumar Inkulu, M.V.A. Raju Bahubalendruni, Ashok Dara, SankaranarayanaSamy K. Industrial Robot, 2022 Purpose In the present era of Industry 4.0, the manufacturing automation is moving toward mass production and mass customization through human–robot collaboration. The purpose of this paper is to describe various human–robot collaborative (HRC) techniques and their applicability for various manufacturing methods along with key challenges. Design/methodology/approach Numerous recent relevant research literature has been analyzed, and various human–robot interaction methods have been identified, and detailed discussions are made on one- and two-way human–robot collaboration. Findings The challenges in implementing human–robot collaboration for various manufacturing process and the challenges in one- and two-way collaboration between human and robot are found and discussed. Originality/value The authors have attempted to classify the HRC techniques and demonstrated the challenges in different modes.
Enhancing product quality incorporating additive manufacturing on recycled inventory system with deterioration and delayed payment B Priskilla, GS Mahapatra, MVAR Bahubalendruni, D Balasubramanian, ... Scientific Reports , 2026 2026
Experimental and numerical investigation on 2.5-dimensional nature-inspired infill structures under out-plane quasi-static loading D Ashok, MVAR Bahubalendruni, A Mhaskar, V Choudhary, G Balamurali, ... Proceedings of the Institution of Mechanical Engineers, Part E: Journal of … , 2025 2025 Citations: 59
Quasi-static and dynamic response of open lattice structures for enhanced plateau stresses: simulation and experiment validation A Dara, J Mertens, B Gunji, MVAR Bahubalendruni Materials Today Communications 44, 111953 , 2025 2025 Citations: 43
Experimental characterization and numerical investigation on different conformal lattice structures for specific energy absorption under quasi-static and dynamic loading MR Bahubalendruni International Journal of Protective Structures, 1-20 , 2025 2025 Citations: 27
Experimental and numerical evaluation of tessellated lattice structure under inplane compression loading D Ashok, MVAR Bahubalendruni, J Mertens Materials Today: Proceedings 115, 89-94 , 2024 2024 Citations: 5
Characterization of penetrate and interpenetrate tessellated cellular lattice structures for energy absorption A Dara, A Johnney Mertens, MVA Raju Bahubalendruni Proceedings of the Institution of Mechanical Engineers, Part L: Journal of … , 2023 2023 Citations: 69
Design and characterization of 2.5 D nature‐inspired infill structures under out‐plane quasi‐static loading condition D Ashok, MVAR Bahubalendruni Advances in Materials Science and Engineering 2023 (1), 8918937 , 2023 2023 Citations: 33
A novel nature inspired 3D open lattice structure for specific energy absorption D Ashok, MVA Raju Bahubalendruni, A Johnney Mertens, G Balamurali Proceedings of the Institution of Mechanical Engineers, Part E: Journal of … , 2022 2022 Citations: 99
Numerical and experimental investigations of novel nature inspired open lattice cellular structures for enhanced stiffness and specific energy absorption A Dara, MVAR Bahubalendruni, AJ Mertens, G Balamurali Materials Today Communications 31, 103286 , 2022 2022 Citations: 149
Challenges and opportunities in human robot collaboration context of Industry 4.0-a state of the art review AK Inkulu, MVAR Bahubalendruni, A Dara, SS K Industrial Robot: the international journal of robotics research and … , 2022 2022 Citations: 239
A novel Geometric feasibility method to perform assembly sequence planning through oblique orientations GA Kumar, MVAR Bahubalendruni, VSSV Prasad, D Ashok, ... Engineering Science and Technology, an International Journal 26, 100994 , 2022 2022 Citations: 50
Does Topology Optimization Exist in Nature? A. Dara et al. A Dara, MVAR Bahubalendruni, AJ Mertens National Academy Science Letters 45 (1), 69-73 , 2022 2022 Citations: 38
Topology optimization of bench problems—stress and deformation perspective D Ashok, MVA Raju Bahubalendruni, J Mertens Recent Advances in Manufacturing, Automation, Design and Energy Technologies … , 2021 2021 Citations: 7
An Experimental investigation of new hybrid composite material using ramie-flax and its mechanical properties through finite element method D Ashok, S Puhan, R Pradhan, P Kiran Babu, Y Srinivasa Reddy Recent Trends in Mechanical Engineering: Select Proceedings of ICIME 2019 … , 2020 2020 Citations: 4
Experimental analysis of convergent inlet manifold for IC engines YS Reddy, JS Md, D Ashok, KR Babu Materials Today: Proceedings 33, 668-674 , 2020 2020 Citations: 2
Fracture, Fatigue Growth Rate And Vibration Analysis Of Camshaft In Railways P Kavuri, D Ashok INTERNATIONAL JOURNAL OF ENGINEERING DEVELOPMENT AND RESEARCH 6 (3), 301-306 … , 2018 2018
Design and structural analysis of composite multi leaf spring D Ashok, MV Mallikarjun, VR Mamilla International Journal of Emerging trends in Engineering and Development … , 2012 2012 Citations: 46
MOST CITED SCHOLAR PUBLICATIONS
Challenges and opportunities in human robot collaboration context of Industry 4.0-a state of the art review AK Inkulu, MVAR Bahubalendruni, A Dara, SS K Industrial Robot: the international journal of robotics research and … , 2022 2022 Citations: 239
Numerical and experimental investigations of novel nature inspired open lattice cellular structures for enhanced stiffness and specific energy absorption A Dara, MVAR Bahubalendruni, AJ Mertens, G Balamurali Materials Today Communications 31, 103286 , 2022 2022 Citations: 149
A novel nature inspired 3D open lattice structure for specific energy absorption D Ashok, MVA Raju Bahubalendruni, A Johnney Mertens, G Balamurali Proceedings of the Institution of Mechanical Engineers, Part E: Journal of … , 2022 2022 Citations: 99
Characterization of penetrate and interpenetrate tessellated cellular lattice structures for energy absorption A Dara, A Johnney Mertens, MVA Raju Bahubalendruni Proceedings of the Institution of Mechanical Engineers, Part L: Journal of … , 2023 2023 Citations: 69
Experimental and numerical investigation on 2.5-dimensional nature-inspired infill structures under out-plane quasi-static loading D Ashok, MVAR Bahubalendruni, A Mhaskar, V Choudhary, G Balamurali, ... Proceedings of the Institution of Mechanical Engineers, Part E: Journal of … , 2025 2025 Citations: 59
A novel Geometric feasibility method to perform assembly sequence planning through oblique orientations GA Kumar, MVAR Bahubalendruni, VSSV Prasad, D Ashok, ... Engineering Science and Technology, an International Journal 26, 100994 , 2022 2022 Citations: 50
Design and structural analysis of composite multi leaf spring D Ashok, MV Mallikarjun, VR Mamilla International Journal of Emerging trends in Engineering and Development … , 2012 2012 Citations: 46
Quasi-static and dynamic response of open lattice structures for enhanced plateau stresses: simulation and experiment validation A Dara, J Mertens, B Gunji, MVAR Bahubalendruni Materials Today Communications 44, 111953 , 2025 2025 Citations: 43
Does Topology Optimization Exist in Nature? A. Dara et al. A Dara, MVAR Bahubalendruni, AJ Mertens National Academy Science Letters 45 (1), 69-73 , 2022 2022 Citations: 38
Design and characterization of 2.5 D nature‐inspired infill structures under out‐plane quasi‐static loading condition D Ashok, MVAR Bahubalendruni Advances in Materials Science and Engineering 2023 (1), 8918937 , 2023 2023 Citations: 33
Experimental characterization and numerical investigation on different conformal lattice structures for specific energy absorption under quasi-static and dynamic loading MR Bahubalendruni International Journal of Protective Structures, 1-20 , 2025 2025 Citations: 27
Topology optimization of bench problems—stress and deformation perspective D Ashok, MVA Raju Bahubalendruni, J Mertens Recent Advances in Manufacturing, Automation, Design and Energy Technologies … , 2021 2021 Citations: 7
Experimental and numerical evaluation of tessellated lattice structure under inplane compression loading D Ashok, MVAR Bahubalendruni, J Mertens Materials Today: Proceedings 115, 89-94 , 2024 2024 Citations: 5
An Experimental investigation of new hybrid composite material using ramie-flax and its mechanical properties through finite element method D Ashok, S Puhan, R Pradhan, P Kiran Babu, Y Srinivasa Reddy Recent Trends in Mechanical Engineering: Select Proceedings of ICIME 2019 … , 2020 2020 Citations: 4
Experimental analysis of convergent inlet manifold for IC engines YS Reddy, JS Md, D Ashok, KR Babu Materials Today: Proceedings 33, 668-674 , 2020 2020 Citations: 2
Enhancing product quality incorporating additive manufacturing on recycled inventory system with deterioration and delayed payment B Priskilla, GS Mahapatra, MVAR Bahubalendruni, D Balasubramanian, ... Scientific Reports , 2026 2026
Fracture, Fatigue Growth Rate And Vibration Analysis Of Camshaft In Railways P Kavuri, D Ashok INTERNATIONAL JOURNAL OF ENGINEERING DEVELOPMENT AND RESEARCH 6 (3), 301-306 … , 2018 2018
