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energy absorption characteristics of a Novel Asymmetric and Rotatable Re-entrant Honeycomb Structure

Acta Mechanica Solida Sinica 2021年第4期34卷 550-560页

作者： Huifeng Xi Jiachu Xu Shende Cen Shiqing Huang MOE Key Laboratory of Disaster Forecast and Control in Engineering and School of Mechanics and Construction Engineering Jinan UniversityGuangzhou510632China

Based on the symmetric re-entrant honeycomb(S-RH)structure with negative Poisson’s ratios,a novel asymmetric and rotatable re-entrant honeycomb(AR-RH)structure was *** the S-RH structure and AR-RH structure were produced by the 3D printing *** experimental test and finite element simulation,the deformation mechanism and energy absorption characteristics of the AR-RH structure and the S-RH structure with negative Poisson’s ratios at different impact velocities were *** experimental test and finite element simulation results show that the novel AR-RH structure with negative Poisson’s ratios has stronger energy absorption capacity than the S-RH structure,and it has been verified that the rotatability of AR-RH can indeed absorb ***,the degree of asymmetry of the AR-RH structure was discussed.

关键词： Asymmetric and rotatable re-entrant honeycomb structure Dynamic compression energy absorption characteristics Metal 3D printing technology

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Analysis of energy absorption characteristics of Typical High Strength Steel Based on Drop Test

Analysis of Energy Absorption Characteristics of Typical Hig...

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2018中国汽车工程学会年会

作者： ZHANG Wei LI Chunguang YANG Jianwei LIU Lixian CHEN Qing WEI Fulin Application Technology Department Shougang Research Institute of Technology

The drop test is an important method to analyze the energy absorption characteristics of materials,which causes the sample to collapse axially and absorb energy by initial energy ***-shaped beam is a typical structure of energy absorber of front longitudinal beam of *** is widely used for its light weight,high strength and good energy *** four typical highstrength steels:HC340 LAD + Z,HC420/DP780 D + Z,HC550/DP980 D + Z,and TRIP690,the cap girder structure is obtained through stamping and welding,and the test is taken based on the drop *** to the test results,evaluation indexes such as energy absorption ratio,load ratio,maximum load and average load are obtained,and the energy absorption characteristics of the materials are compared and *** results show that the energy absorption characteristics of different materials are quite different,and the energy absorption ratio of the materials tends to decrease gradually as the material strength increases.

关键词： drop test energy absorption characteristics high strength steel thin-walled beam

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Impact response and energy absorption of metallic buffer with entangled wire mesh damper

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Defence Technology（防务技术） 2024年第5期35卷 137-150页

作者： Chao Zheng Jun Wu Mangong Zhang Xin Xue Institute of Metal Rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350116China Wuhan Second Ship Design and Research Institute Wuhan 430205China

An innovative metallic buffer consisting of series-connected hat-shaped entangled wire mesh damper(EWMD)and parallel springs are proposed in this work to enhance the reliability of engineering *** impact response and the energy dissipation mechanism of hat-shaped EWMD under different quasi-static compression deformations(2-7 mm)and impact heights(100-200 mm)are investigated using experimental and numerical *** results demonstrate distinct stages in the quasi-static mechanical characteristics of hat-shaped EWMD,including stiffness softening,negative stiffness,and stiffness *** loss factor gradually increases with increasing compression deformation before entering the stiffness hardening *** impact loads,the hat-shaped EWMD exhibits optimal impact energy absorption when it enters the negative stiffness stage(150 mm),resulting in the best impact isolation effect of metallic ***,the impact energy absorption significantly decreases when hat-shaped EWMD enters the stiffness hardening ***,quasi-static compression analysis after experiencing different impact loads reveals the disappearance of the negative stiffness ***,with increasing impact loads,the stiffness hardening point progressively shifts to an earlier stage.

关键词： Metallic buffer Hat-shaped EWMD Drop impact energy absorption characteristics Mechanical behavior

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Mechanical behavior and response mechanism of porous metal structures manufactured by laser powder bed fusion under compressive loading

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International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 737-749页

作者： Xuanming Cai Yang Hou Wei Zhang Zhiqiang Fan Yubo Gao Junyuan Wang Heyang Sun Zhujun Zhang Wenshu Yang School of Aerospace Engineering North University of ChinaTaiyuan 030051China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China School of Astronautics Harbin Institute of TechnologyHarbin 150080China School of Mechanical Engineering North University of ChinaTaiyuan 030051China Shijiazhuang Campus Army Engineering University of PLAShijiazhuang 050003China 65589 Unit 91 Detachment Daqing 163411China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150080China

Al Si10Mg porous protective structure often produces different damage forms under compressive loading,and these damage modes affect its protective *** order to well meet the service requirements,there is an urgent need to comprehensively understand the mechanical behavior and response mechanism of AlSi10Mg porous structures under compressive *** this paper,Al Si10Mg porous structures with three kinds of volume fractions are designed and optimized to meet the requirements of high-impact,strong-energy absorption,and lightweight *** mechanical behaviors of AlSi10Mg porous structures,including the stress-strain relationship,structural bearing state,deformation and damage modes,and energy absorption characteristics,were obtained through experimental studies at different loading *** damage pattern of the damage section indicates that AlSi10Mg porous structures have both ductile and brittle mechanical *** simulation studies show that the AlSi10Mg porous structure undergoes shear damage due to relative misalignment along the diagonal cross-section,and the damage location is almost at 45°to the load direction,which is the most direct cause of its structural damage,revealing the damage mechanism of AlSi10Mg porous structures under the compressive *** normalized energy absorption model constructed in the paper well interprets the energy absorption state of Al Si10Mg porous structures and gives the sensitive location of the structures,and the results of this paper provide important references for peers in structural design and optimization.

关键词： AlSi10Mg additive manufacture energy absorption characteristics damage by deformation mechanical behavior

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基于Hyperworks 和LS-DYNA 的类蜂窝结构吸能效果分析和优化

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建模与仿真 2024年第1期13卷 169-182页

作者：耿治港上海理工大学机械工程学院，上海

蜂窝结构的材料具有相对密度低、韧性高、重量轻、隔热隔音效果好、吸能性能好等特点。因为蜂窝结构有这些优点，所以它被大量应用于航天、机械、包装、汽车等领域。以蜂窝结构为切入点，对其吸能性能进行研究时，从面内冲击、面外冲击... 详细信息

蜂窝结构的材料具有相对密度低、韧性高、重量轻、隔热隔音效果好、吸能性能好等特点。因为蜂窝结构有这些优点，所以它被大量应用于航天、机械、包装、汽车等领域。以蜂窝结构为切入点，对其吸能性能进行研究时，从面内冲击、面外冲击两个方面进行了深入探讨。就前者而言，可将其优势充分反映出来，且在工程应用方面有着更大的价值。因此本文将研究蜂窝结构壁厚和折角对吸能性能的影响和优化分析。首先，基于有限元分析方法分析了蜂窝结构在面内的冲击载荷作用下，在固定区域内蜂窝结构胞体的壁厚、折角对蜂窝结构总吸能、总质量、比吸能的影响。最后，以结构壁厚和折角作为设计变量，以比吸能和质量作为优化目标，建立近似代理模型，运用第二代非支配排序遗传算法(NSGA-II)对多胞结构进行了多目标优化设计，得到了结构的pareto解集，经多目标优化后的结构达到了固定区域内最大总吸能、最小总质量。

关键词：蜂窝结构面内冲击吸能特性优化分析 Honeycomb Structure In-Plane Impact energy absorption characteristics Multi-Objective Optimization

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