Isolating and observing the damage mechanisms associated with low-velocity impact in composites using traditional experiments can be challenging, due to damage process complexity and high strain rates. In this work, a new test method is presented that provides a means to study, in detail, the interaction of common impact damage mechanisms, namely delamination, matrix cracking, and delamination-migration, in a context less challenging than a real impact event. Carbon fiber reinforced polymer specimens containing a thin insert in one region were loaded in a biaxial-bending state of deformation. As a result, three-dimensional damage processes, involving delaminations at no more than three different interfaces that interact with one another via transverse matrix cracks, were observed and documented using ultrasonic testing and X-ray computed tomography. The data generated by the test is intended for use in numerical model validation. Simulations of this test are included in Part II of this paper.

由于损伤过程的复杂性和高应变率，使用传统实验隔离和观察与复合材料中低速冲击相关的损伤机制可能具有挑战性。在这项工作中，提出了一种新的测试方法，该方法提供了一种手段来详细研究常见冲击损伤机制（即分层，基体破裂和分层迁移）的相互作用，而这种挑战的挑战性要小于实际冲击事件。碳纤维增强的聚合物样本在一个区域中包含一个薄的插入物，以双轴弯曲变形状态加载。结果，三维损伤过程涉及到不超过三个不同界面的分层，这些界面通过横向基体裂纹相互作用，使用超声波测试和X射线计算机断层扫描观察和记录。测试生成的数据旨在用于数值模型验证。该测试的仿真包含在本文的第二部分中。