论文部分内容阅读
机械损伤是否产生取决于损伤驱动力及损伤抗力 ,对于陶瓷涂层而言 ,区别于单质固体的是 ,其损伤驱动力及损伤抗力二者都与材料本身相关 ,二者都受涂层与基体材料间的热学及力学匹配、涂层与基体材料的弹塑性性能、涂层的厚度及显微组织、以及涂层与基体界面的粗糙度等因素的影响。因此 ,涂层的热—机械行为的完整表征必须借助于基于破坏机制的损伤图才能完成。这种损伤图将相关参数有机地结合在一起 ,从而定出损伤安全区。而建立这种损伤图 ,必须有可靠的实验技术以测定涂层及界面的断裂韧性。而这种测试技术仍处于发展阶段 ,迄今并无完善的方法。作者正在研究及发展的多应变开裂及失稳试验 ,可能是目前最为简便易行而可靠的方法。本文略述测试与损伤图相关的参数的试验方法。
Whether the mechanical damage is generated depends on the damage driving force and the damage resistance. For the ceramic coating, different from the elemental solid, both the damage driving force and the damage resistance are related to the material itself, and both are affected by the coating and the substrate The thermal and mechanical matching between materials, the elasto-plastic properties of coating and matrix, the thickness and microstructure of coating, the roughness of interface between coating and substrate. Therefore, the complete characterization of the thermo-mechanical behavior of the coating must be done by means of a damage map based on the destruction mechanism. This damage map organically combines the relevant parameters to define the damage safety zone. The establishment of this damage map, there must be reliable experimental techniques to determine the coating and interface fracture toughness. And this kind of test technology is still in the development stage, so far there is no perfect method. The multi-strain cracking and destabilizing tests the author is studying and developing may be the easiest and most reliable method available today. This article outlines the test method for testing parameters related to damage maps.