Falkowicz Katarzyna
Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 38, 20-618 Lublin, Poland.
Materials (Basel). 2024 Apr 23;17(9):1943. doi: 10.3390/ma17091943.
In the present study, the stability and failure phenomena of thin-walled constructions subjected to axial compression, featuring a central cut-out, and constructed from composite materials were explored. These constructions were fabricated from a carbon-epoxy composite using the autoclave method. The research encompassed experimental assessments on actual specimens alongside numerical analyses employing the finite element approach within the ABAQUS software. The investigation spanned the entire load spectrum up to the point of structural failure, incorporating both practical trials and simulation analysis. During the practical assessments, the study monitored the post-buckling response and captured acoustic emissions to thoroughly evaluate the composite's failure mechanisms. Additionally, the ARAMIS system's non-invasive three-dimensional scanning was employed to assess deformations. Theoretical simulations utilized a step-by-step failure analysis, initiating with failure onset as per Hashin's theory and proceeding to failure progression based on an energy criterion. The simulation outcomes, particularly concerning the critical and post-critical phases, were juxtaposed with empirical data to identify the composite's vulnerability zones. The comparison underscored a significant concordance between the simulation predictions and the empirical findings.
在本研究中，对由复合材料制成的带有中心切口的薄壁结构在轴向压缩下的稳定性和失效现象进行了探索。这些结构采用热压罐法由碳 - 环氧复合材料制成。该研究包括对实际试件的实验评估以及在ABAQUS软件中采用有限元方法进行的数值分析。研究涵盖了直至结构失效点的整个载荷谱，包括实际试验和模拟分析。在实际评估过程中，该研究监测了屈曲后响应并捕捉了声发射，以全面评估复合材料的失效机制。此外，采用ARAMIS系统的非侵入式三维扫描来评估变形。理论模拟采用逐步失效分析，根据Hashin理论从失效起始点开始，并基于能量准则进行失效进展分析。模拟结果，特别是关于临界和临界后阶段的结果，与实验数据并列，以确定复合材料的易损区域。比较结果突出了模拟预测与实验结果之间的显著一致性。
