A simple interface fracture test for ceramic environmental barrier coatings (EBCs) on ceramic matrix composites (CMCs) was developed. A variation on the asymmetric double cantilever beam (ADCB) test was proposed so that the interface toughness could be measured in a small specimen of simple shape without applying interlaminar loading to the CMC substrate. The proposed test was applied to an EBC consisting of a mullite layer and Si bond coat on a monolithic SiC substrate. A pre-crack was introduced by pop-in cracking, and then a notch overlapping the pre-crack was machined. The pre-crack was opened by inserting a wedge into the notch. From the critical notch opening displacement the crack starts to propagate, interface toughness is calculated. The measured interface toughness was 4.1 J/m2. Finally, the application range of the test was discussed and suggestions were made for introduction of the notch and pre-crack.

针对陶瓷基复合材料（CMC）上的陶瓷环境屏障涂层（EBC），开发了一种简单的界面断裂试验。提出了不对称双悬臂梁（ADCB）试验的一种变型，这样就可以在一个简单形状的小样品中测量界面韧性，而无需在CMC基板上施加层间载荷。拟议的测试应用于由莫来石层和单片SiC衬底上的Si键合涂层组成的EBC。通过弹出裂纹引入预裂纹，然后加工与预裂纹重叠的缺口。通过将楔形件插入槽口中来打开预裂缝。从临界缺口开口位移开始裂纹扩展，计算出界面韧性。测得的界面韧性为4.1J / m 2。最后，