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本文涉及玻璃纤维增强聚酯复台材料的层间断裂能。该试验采用锥形宽度双悬臂梁(WTD-CB)试样。探讨了试样的柔度和断裂行径,以及试样几何形状对断裂能的影响,亦研究了在液氮温度(77°K)下的断裂能。业已发现,测得的断裂能随试样高度的增加而减少,最后趋于一恒定值。Extren断裂试验所需的最小高度为1/2英寸。断裂能随试样难度的减少而稍有减少。随着试样宽度的加大,可看到载荷——变形滞后现象趋于明显。滞后的的程度决于试样梁的体积,即高度、锥度和裂纹长度。液氮温度(77°K)F的断裂能比室温的约大三倍,垂直于纤维方向的断裂能稍高于纤维方向的。
This paper deals with the interlaminar fracture energy of glass fiber reinforced polyester composite materials. The test uses a tapered width double cantilever (WTD-CB) specimen. The softness and fracture behavior of the specimens were investigated. The influence of specimen geometry on fracture energy was also investigated. The fracture energy at liquid nitrogen temperature (77 ° K) was also investigated. It has been found that the measured fracture energy decreases with increasing sample height and eventually tends to a constant value. The minimum height required for an Extren fracture test is 1/2 inch. Fracture can be slightly reduced with the difficulty of the sample. As the specimen width increases, we can see the load-deformation hysteresis tends to be obvious. The degree of hysteresis depends on the sample beam volume, ie height, taper and crack length. Liquid nitrogen temperature (77 ° K) F fracture energy greater than about three times the room temperature, perpendicular to the fiber fracture direction can be slightly higher than the fiber direction.