Purpose

The purpose of this paper is to synthetically investigate the impact damage responses of carbon fiber reinforced polymer (CFRP) and its influence on the compression mechanical responses of CFRP laminates, including damage distribution, residual compressive strength and fracture morphology.

Design/methodology/approach

A progressive damage simulation model is developed to analyze the complicated damage responses of CFRP laminates that are manufactured by resin transfer method (RTM) technology. Based on the ABAQUS/explicit finite element analysis solver, a VUMAT code is proposed to descript the composite materials’ damage behaviors under both impact and compression load. Adopting this proposed model, the primary mechanical indicators of four groups’ 5284RTM/U3160 CFRP laminates with different stacking sequences are predicted. Moreover, impact and compression after impact tests are conducted to verify the accuracy of simulation results.

Findings

Both simulation and experimental results show that the impact damage with low visible detectability can significantly reduce composites’ compressive strength. For all four groups’ composite laminates, the residual strength ratio is around 35% or even lower. The kernel impact damage near the plates’ geometric center promotes the degradation process of local materials and finally leads to the early occurrence of mechanical fracture. In addition, the impact damage projection area is not sensitive to the parameters of stacking sequences, while the residual compression strength is proportional to the number of 0-degree layers within whole laminates.

Originality/value

This study helps to understand the effect of an impact event on CFRP laminates’ compressive bearing capacity and provides a numerical method in simulating the damage responses under both impact and compression load.

中文翻译：

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RTM技术制造的CFRP层压板的BVID和CAI行为的实验和模拟研究

目的

本文的目的是综合研究碳纤维增强聚合物（CFRP）的冲击损伤响应及其对CFRP层压板压缩力学响应的影响，包括损伤分布、残余抗压强度和断裂形态。

设计/方法/方法

建立了渐进式损伤模拟模型来分析采用树脂转移法 (RTM) 技术制造的 CFRP 层压板的复杂损伤响应。基于ABAQUS/explicit有限元分析求解器，提出了一个VUMAT代码来描述复合材料在冲击和压缩载荷下的损伤行为。采用该模型，预测了四组不同堆叠顺序的5284RTM/U3160 CFRP层压板的主要力学指标。此外，还进行了冲击试验和冲击试验后的压缩试验，以验证模拟结果的准确性。

发现

模拟和实验结果均表明，具有低可见可探测性的冲击损伤会显着降低复合材料的抗压强度。四组复合材料层压板的残余强度比都在35%左右，甚至更低。板块几何中心附近的内核冲击损伤促进了局部材料的降解过程，最终导致机械断裂的早期发生。此外，冲击损伤投影面积对堆叠顺序参数不敏感，而残余抗压强度与整个层压板内的0度层数成正比。

原创性/价值

这项研究有助于了解冲击事件对 CFRP 层压板压缩承载能力的影响，并提供了一种数值方法来模拟冲击和压缩载荷下的损坏响应。