| 1. | The accepted designation for the plane-strain fracture toughness under these environments is this .
在这些环境下平面应变断裂韧性所采用的符号是这个。 |
| 2. | Metallic materials - determination of plane - strain fracture toughness
金属材料.平面应变断裂强度的测定 |
| 3. | Standard test method for plane - strain fracture toughness of metallic materials
金属材料平面应变断裂韧度kic试验方法 |
| 4. | Standard practice for plane - strain fracture toughness testing of aluminum alloys
铝合金的平面应变断裂韧性试验的标准实施规程 |
| 5. | Standard test method for linear - elastic plane - strain fracture toughness k ic of metallic materials
金属材料线弹性平面应变断裂韧度k ic的标准试验方法 |
| 6. | Standard test methods for plane - strain fracture toughness and strain energy release rate of plastic materials
塑料材料平面应变断裂韧性和应变能量释放率的标准试验方法 |
| 7. | Klc of j3 is higher than j2 and j1 at different temperatures , and this shows the stronger ability of j3 to resist crack expanding . two probations have been tried to explore the reasons concerning the results above , one of which is by analyzing the compositions of the three pbxs above and shows that the stronger ability of j3 to resist crack expanding is probably mainly due to the use of bonder b2 , and another is by using scanning electronic microscope sem to observe the fracture face morphologies of the specimens at different temperatures . the quantitative observations strongly support the laws of klc of pbxs changes with temperature is revealed as follows : a
测试了三种高聚物粘结炸药在不同温度下的平面应变断裂韧度k _ ( ic )值，得到了这三种炸药的平面应变断裂随温度的变化规律： a 、随着温度的增加，高聚物粘结炸药的平面应变断裂韧度降低； b 、在45以后j2的平面应变断裂韧度降低最快，在60时已很差，比j1还低，可以认为j2在高温下的抗裂纹扩展的能力比j1还差； c 、在不同温度下， j3的平面应变断裂韧度比j2和j1的均高，表现出相对较强的抗裂纹扩展能力。 |
| 8. | Based on the theory of fracture mechanics , the relation between the critical stress intensity factors for v - notch kc and the plane strain crack toughness k10c and the brittle fracture criterion of the maximum circumferential stress for single and double stress singularity with the v - notch problems are proposed . experiments were carried out using two kinds of v - notched specimens made out of plexiglas to verify this brittle fracture criterion
本文基于断裂力学原理，推导出了型切口的临界应力强度因子k _ c与材料的平面应变断裂韧度k _ ( 10c )之间的关系，给出了平面单奇异性和双奇异性型切口问题的最大周向应力脆性断裂准则，并用有机玻璃板材加工了两种型切口试样，进行了实验验证。 |
| 9. | The results at normal temperature have shown that klc of high polymer bonded explosive are very low comparing to metals and some high polymer materials , thus the ability of pbxs to resist crack expanding is very poor , and once some cracks occur inner a structural part of pbxs , the structure will fail very soon and easily . so in the process of machining and production , cracks should be avoided carefully in pbxs parts . some important laws about klc of the three typical pbxs above changes with temperature have been obtained as follows : a
对三种具有代表性的高聚物粘结炸药j1 、 j2和j3在常温下的平面应变断裂韧度进行了测试与研究，研究结果表明：相对于金属及某些高分子材料而言，高聚物粘结炸药的k _ ( ic )值很低，即高聚物粘结炸药的抗裂纹扩展能力是极差的，一旦炸药构件中产生了裂纹，炸药构件将极易破坏，因此，在高聚物粘结炸药构件的生产及加工过程中，应避免裂纹的产生。 |
| 10. | The method for measuring the plane strain fracture toughness klc has been introduce to high polymer bonded explosives ( pbx ) by systematically studying technologies concerning the shape of specimen , the depth and its machining of crack , the loading rate , the measurement of critical fracture load , and the computation of klc , etc . the method has been used to test and study klc of three typical high polymer bonded explosives which are j2 , jl , j3 respectively both at normal temperature and unmoral temperature
本文以高聚物粘结炸药为研究对象，对测试高聚物粘结炸药的平面应变断裂韧度所涉及的样品形状、裂纹深度及裂纹制备、加载速度、临界断裂载荷p _ q的确定及平面应变断裂韧度k _ ( ic )的计算等方面进行深入研究，建立了较为完善的炸药平面应变断裂韧度测试方法。 |
