The perforation performance is an important index of oil - layer casing representing the resistance to initial brittle crack growth.
射孔性能是油层套管很重要的一项指标，它代表着油层套管抵抗裂纹脆性扩展的能力。
2
The crosslinked blend membrane had the best separating performances including good resistance against solvent andmicrobes, but it was a little brittle.
共混交联膜具有最好的分离性能，而且耐溶剂，抗菌，但稍显脆性。
3
The existence of grey spot may cause brittle crack of the joint, therefore, controlling grey spot occupy a decisive position to ensure the quality of rail resistance welding.