Coarsening grain and intercrystalline network ferrite depress crackgrowthresistance of the materials strongly and result in unstable propagation of crack very easily.
晶粒粗大及晶间网状铁素体强烈降低材料的裂纹扩展阻力，并极易导致裂纹的失稳扩展。
2
The perforation performance is an important index of oil - layer casing representing the resistance to initial brittle crackgrowth.
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。
3
An energy method for determining fracture toughness of fibrous composite laminates was based on the theory of elastic energy release rate and crack-growthresistance in this paper.