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1)  crack tip opening displacement
裂纹尖端张开位移
1.
0 for predicting the welding performance parameter-crack tip opening displacement (CTOD)-of high strength pipeline steel joint.
0建立了预测高强度管线钢焊接接头性能参数裂纹尖端张开位移(CTOD)的BP神经网络模型。
2.
Based on BS7448 fracture toughness test experiment standard (ISO/TC164/SC4-N400) and DNV-OS-C401, crack tip opening displacement (CTOD) tests are carried out on 80 mm thick plates butt joints of offshore petroleum platform joined by the submerged-arc welding and CO2 gas shielded welding.
依据英国标准BS7448断裂韧度试验标准(ISO/TC164/SC4-N400)和DNV-OS-C401,采用埋弧焊和CO2气体保护焊工艺对国产钢板板厚为80mm的海洋石油平台导管架对接接头试样进行了低温裂纹尖端张开位移(CTOD)试验。
3.
The measuring and testing technique of crack tip opening displacement (CTOD)tests for large welded joints in the offshore platform under low environmental temperatures of -15℃ were performed in accordance with the BS 7448 standard (part2,1997).
依据BS74 4 8断裂韧度试验标准 (ISO/TC16 4 /SC4 -N4 0 0 ) ,对采用埋弧焊 (SAW)工艺施焊的、板厚为 5 4mm的海洋石油平台大厚度对接接头试样进行了低温裂纹尖端张开位移 (CTOD)试验。
2)  CTOD
裂纹尖端张开位移
1.
Experimeneal research on high Temperature CTOD of electron beam welded joints of GH4169 alloy;
电子束焊GH4169合金高温裂纹尖端张开位移试验
2.
Then regression equation is obtained between CTOD and welding parameter.
应用一次回归正交设计法,对X70管线钢环焊过程的焊接工艺参数进行设计,采用设计后的焊接工艺对X70管线管进行施焊,对环焊接头进行裂纹尖端张开位移试验,最后回归得到CTOD值与焊接工艺之间的回归数学模型。
3)  crack tip opening displacement(CTOD)
裂纹尖端张开位移(CTOD)
4)  critical crack tip opening displacement δIc
临界裂纹尖端张开位移δIc
5)  critical crack tip opening displacement
临界裂缝尖端张开位移
1.
The results show that G_(fF),critical crack mouth opening displacement(δ_(fmc)) as well as critical crack tip opening displacement(δ_(ftc)) of SFHAC increase linearly with the increas.
结果表明:随着φf的增加,GfF、临界裂缝嘴张开位移(fδmc)、临界裂缝尖端张开位移fδtc均线性增加,钢纤维高强混凝土断裂能增益比、临界裂缝嘴张开位移和临界裂缝尖端张开位移的增益比亦基本呈线性增加。
2.
In order to investigate the size effect of the fracture toughness of concrete,the size effect law deduced from Weibull s statistical theory was compared with that from Bazant s energy release principle,and three fracture parameters,namely,the initiatial fraction toughness(Kini1c),the unstable toughness(Kun1c) and the critical crack tip opening displacement(δc) were tested.
为研究混凝土断裂韧度的尺寸效应,将基于Weibull统计理论的尺度律与基于Bazant能量释放原理的尺度律进行对比,进行了3种混凝土断裂韧度,即起裂韧度Ki1nci、失稳韧度Ku1nc及临界裂缝尖端张开位移δc的试验研究。
6)  rack tip opening displacement
裂缝尖端张开位移
1.
It is difficult to measure the crack tip opening displacement(CTOD) of a concrete dam because the subcritical propagation of the crack often occurs before the fracture does.
由于混凝土坝裂缝在失稳扩展前常发生亚临界扩展,难以测量混凝土坝裂缝尖端张开位移,且通过试验获得稳定的临界裂缝尖端张开位移比较困难,因此不能直接应用裂缝尖端张开位移理论分析混凝土坝裂缝失稳扩展。
补充资料:裂纹尖端张开位移
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性质:在外载荷的作用下,裂纹尖端两表面间的张开位移。用符号δ表示。由于在弹塑性条件下,已得到δ与工作应力σ(或应变ε)以及裂纹尺寸a(裂纹的半长)之间的关系,因此它是弹塑性断裂力学中的一个重要参量。 

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