Application of the size effect law to the determination of R-curves for transverse cracking in polymer matrix composite laminates using single edge notched bend specimens
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Abstract
The R-curves for transverse cracking could be determined based on the size effect law using SENB specimens, where the R-curves determined by the size effect law were consistent with those determined by the compliance method. The crack growth resistance in the steady-state and the crack extension at the onset of the steady-state of carbon-fiber/epoxy laminates, T800S/2592, were determined to be 0.22 N/mm and 0.36 mm, respectively. The crack growth stability in SENB specimens depended not only on the load control method but also on the specimen geometry, whereas a unique R-curve could be obtained regardless of the crack growth stability.
使用 SENB 试样可根据尺寸效应定律确定横向开裂的 R 曲线，其中尺寸效应定律确定的 R 曲线与顺应性方法确定的 R 曲线一致。经测定，碳纤维/环氧层压板 T800S/2592 的稳态裂纹生长阻力和稳态开始时的裂纹扩展阻力分别为 0.22 N/mm 和 0.36 mm。SENB 试样的裂纹生长稳定性不仅取决于载荷控制方法，还取决于试样的几何形状，而无论裂纹生长稳定性如何，都能获得独特的 R 曲线。
期刊介绍：
EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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