大、中等质量冲头冲击下支持跨度对复合材料层压板冲击的影响分析

基于ABAQUS软件建立三种支持跨度的层压板三维有限元模型，分别计算在两种质量冲头冲击下的响应和损伤。结果表明，在判断支持跨度对冲击结果的影响时，要考虑冲头质量与板质量的比；在大质量冲头冲击的情况下，层压板的响应呈现准静态特征，层压板支持跨度的变化对，最大接触力、冲击持续时间、分层损伤面积等参数的影响较为简单明确；对于中等质量冲头情况，冲击接触时间减小，层压板振动明显，导致冲头与层压板在冲击过程中会脱离接触。在这种情况下不同跨度下板的响应差异也较为明显，冲击力的大小和损伤情况要依据具体的分析。从冲击接触时间和层压板固有振动周期的角度分析了冲头质量水平对冲击响应的影响。

INFLUENCE OF SPAN ON THE RESPONSE AND DAMAGE OF COMPOSITE LAMINATE UNDER LOW-VELOCITY IMPACT INDUCED BY LARGE-MASS AND INTERMEDIATE-MASS

This paper presents the results of numerical investigation concerning span on the responses and damage of composite laminates subjected to low-velocity impact. Three full 3-D composite laminate models of different span are developed using ABAQUS finite element code. Impact responses and damage of these composite laminates under large-mass impact and intermediate-mass impact are investigated. In the large-mass impact, the response of composite laminates is quasi-static, and the influences of span on the peak contact force, the impact duration and delamination are simple and evident. While in the intermediate-mass impact, the responses of the laminate are complex, because the vibrations of the plate are significant and result in the separation of impactor and plate. Special analysis should be taken out for such problems. The influence of mass level on the impact responses are analyzed with ratio between fundamental vibration period and contact duration.