The difference of mechanism between normal section fatigue crack resistance and static crack resistance for prestressed concrete members was analyzed.
针对预应力混凝土构件的正截面疲劳开裂机理与静力开裂机理的差异。
The pre-straining prolonged the fatigue crack initiation life, and increased resistance coefficient and equivalent stress threshold of the fatigue crack initiation.
预应变可以延长疲劳裂纹形成寿命，提高疲劳裂纹形成的抗力系数和裂纹形成的当量应力门槛值；
It is indicated that retained austenite in microstructure can inhibit the initiation and propagation of fatigue crack, improve the resistance to impact fatigue and decrease impact fatigue wear.
试验得出，残余奥氏体可阻止疲劳裂纹的萌生和扩展，提高冲击疲劳抗力，降低冲击疲劳磨损。
Size of reinforcement bar significantly affected the fatigue life of materials, the larger the matrix space can make more resistance to crack propagation.
增强柱的尺寸对材料疲劳寿命影响较大，较大的基体空间可以为裂纹扩展增加更多的阻力。
The experimental results show that adding rare earth into cast semi steel can defer the time of forming fatigue crack, reduce the speed of crack propagating and increase the impact fatigue resistance.
结果表明，稀土能推迟裂纹萌生的时间，降低裂纹扩展速率，提高其冲击疲劳抗力。
After electroplating, can improve the corrosion resistance of the surface of the product, and can delay the expansion of fatigue crack, effectively prolong the service life of the product.
经过电镀后，可以提高产品表面的抗腐蚀能力，并能延缓疲劳裂纹的产生扩大，有效延长产品使用寿命。
The thermal fatigue resistance of alloy with 0.3? Addition is superior to that of other alloys, during crack initiating and propagating.
加入0.3 ？的合金不论在裂纹萌生阶段还是裂纹扩展阶段，其热疲劳抗力都优于其它成分的合金。
The properties of crack resistance, impact resistance, frost resistance and fatigue resistance of cement were improved by adding polypropylene fiber.
在混凝土中掺加聚丙烯纤维能有效地提高混凝土材料的抗裂性、抗冲击性、抗冻性能、改善混凝土的抗疲劳特性。
The properties of crack resistance, impact resistance, frost resistance and fatigue resistance of cement were improved by adding polypropylene fiber.
在混凝土中掺加聚丙烯纤维能有效地提高混凝土材料的抗裂性、抗冲击性、抗冻性能、改善混凝土的抗疲劳特性。
应用推荐