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Crack propagation in CFRP laminates under Mode I monotonic and fatigue loads: A methodological study
Composite Structures ( IF 6.3 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.compstruct.2020.113002 C. Blondeau , G.A. Pappas , J. Botsis
Composite Structures ( IF 6.3 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.compstruct.2020.113002 C. Blondeau , G.A. Pappas , J. Botsis
Abstract Delamination in composite materials is often accompanied by fiber bridging that increases resistance to crack growth. Here, delamination of two unidirectional carbon/epoxy systems was studied under monotonic and displacement-controlled fatigue loading. One material (CP004) presented a random distribution of fiber clusters and matrix-rich zones while the other (SE-84) had an ordered microstructure. The results showed that monotonic and fatigue delamination of CP004 presented similarities, with smooth crack growth and significant bridging. The SE-84 showed no bridging but matrix cohesive failure related to stick–slip growth under monotonic load and adhesive/cohesive failure with limited fiber bridging in fatigue. Data from embedded strain sensors showed that bridging under monotonic and fatigue were similar in CP004. The identified traction-separation relation under monotonic loads was used in a cohesive model to approximate the traction-separation at lower subcritical displacement, corresponding to crack arrest in fatigue. The results demonstrated that monotonic and fatigue delamination may have important similarities (or differences) depending on the microstructure and material properties.
中文翻译:
模式 I 单调和疲劳载荷下 CFRP 层压板的裂纹扩展:方法研究
摘要 复合材料中的分层通常伴随着纤维桥接,从而增加了对裂纹扩展的抵抗力。在这里,在单调和位移控制的疲劳载荷下研究了两个单向碳/环氧树脂系统的分层。一种材料 (CP004) 呈现随机分布的纤维簇和富含基质的区域,而另一种材料 (SE-84) 具有有序的微观结构。结果表明,CP004 的单调和疲劳分层呈现相似性,裂纹扩展平滑,桥接显着。SE-84 没有显示桥接,但在单调载荷下与粘滑增长相关的基体内聚破坏和疲劳时有限的纤维桥接的粘合/内聚破坏。来自嵌入式应变传感器的数据表明,CP004 中单调和疲劳下的桥接是相似的。确定的单调载荷下的牵引-分离关系用于内聚模型,以近似较低亚临界位移下的牵引-分离,对应于疲劳裂纹停止。结果表明,单调和疲劳分层可能具有重要的相似性(或差异),具体取决于微观结构和材料特性。
更新日期:2021-01-01
中文翻译:
模式 I 单调和疲劳载荷下 CFRP 层压板的裂纹扩展:方法研究
摘要 复合材料中的分层通常伴随着纤维桥接,从而增加了对裂纹扩展的抵抗力。在这里,在单调和位移控制的疲劳载荷下研究了两个单向碳/环氧树脂系统的分层。一种材料 (CP004) 呈现随机分布的纤维簇和富含基质的区域,而另一种材料 (SE-84) 具有有序的微观结构。结果表明,CP004 的单调和疲劳分层呈现相似性,裂纹扩展平滑,桥接显着。SE-84 没有显示桥接,但在单调载荷下与粘滑增长相关的基体内聚破坏和疲劳时有限的纤维桥接的粘合/内聚破坏。来自嵌入式应变传感器的数据表明,CP004 中单调和疲劳下的桥接是相似的。确定的单调载荷下的牵引-分离关系用于内聚模型,以近似较低亚临界位移下的牵引-分离,对应于疲劳裂纹停止。结果表明,单调和疲劳分层可能具有重要的相似性(或差异),具体取决于微观结构和材料特性。