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统计分析了28组采用TMCP工艺制造的高强度厚钢板-10℃止裂韧性K_(ca)与屈服强度R_(P0.2)、抗拉强度R_m、-40℃冲击功KV_2、-20℃和-40℃动态撕裂能DTE、零塑性转变温度T_(NDT)的相关性规律,结果表明,-10℃止裂韧性K_(ca)与心部抗拉强度R_m和侧面零塑性转变温度T_(NDT)的相关度较高,随着心部抗拉强度R_m的增高和侧面零塑性转变温度T_(NDT)的降低,-10℃止裂韧性K_(ca)增大;在此基础上建立了-10℃止裂韧性K_(ca)与心部抗拉强度R_m、侧面零塑性转变温度T_(NDT)和板厚t的相关性方程K_(ca)=13.358·R_m-90.530·T_(NDT)-7.324·t~(1.5)或K_(ca)=13.427·R_m-74.845·T_(NDT)-0.635·t~2。 相似文献
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统计分析了26组采用TMCP工艺制造的高强度厚钢板-10℃止裂韧性(K_(ca)~(-10℃))与碳当量(C_(eq))、晶粒度(GS_)、磷含量(w(P))和板厚(t)的相关性规律,结果表明,提高碳当量、增大晶粒度、降低杂质元素磷的含量、减小板厚均有利于止裂韧性的提高,在此基础上建立了止裂韧性与碳当量、晶粒度、磷含量和板厚的回归方程:K_(ca)~(-10℃)=23 443.45·C_(ep)+276.51·G_S-0.77·w(P)·t~3-2.75·t~(1.5)。 相似文献
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建立起以MTS810.15万能材料试验机为主体的材料止裂韧性试验装置,对石油天然气输送管材进行了平面应变止裂韧性(K_(la))测试.结果表明可以运用MTS万能材料试验机进行材料止裂韧性试验,并对材料的止裂韧性进行了分析探讨. 相似文献
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建立起以MTS810.15万能材料试验机为主体的止裂韧性试验装置,对石油天然气输送管材进行了平面应变止裂韧性测试,结果表明可以运用MTS万能材料试验机进行材料止裂韧性试验,并对材料的止裂韧性进行了分析探讨。 相似文献
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针对国际船级社规范UR S33《Requirements for use of extremely thick steel plates》中规定的止裂韧性Kca的测试要求,基于包含温度场参量的计算式证明了止裂韧性Kca测试结果存在不唯一性。 相似文献
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The novel experiment developed in our Institute to investigate crack initiation, rapid crack propagation and crack arrest with one specimen, the ring test, was applied to a ferritic HSLA pipeline steel. The maximum crack speed achieved in these experiments was between 230 m/s and 1165 m/s. The fracture toughness at crack arrest, KIa, was determined by a static analysis of this specific test. In all cases, it was found that KIa was much lower than KIc. The values of KIa decrease when the maximum crack speed increases, the results being largely scattered. The fracture toughness at crack arrest is therefore not an intrinsic parameter of the material for a given temperature. Cleavage fracture obtained under these conditions is characterized by the existence of numerous cleavage microcracks, mechanical twins and unbroken ligaments. The decrease in fracture toughness when crack speed increases is related, using the Beremin or the RKR model, to the high strain rates at the tip of a rapid propagating crack. A model which takes into account the effect of unbroken ligaments left in the wake of a propagating crack is developed to account for the large values of KIa which were occasionally measured. 相似文献
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Recent experimental and computational work by Link and associates has demonstrated that relatively small (W = 150 mm) single edge notched tension specimens (SE(T)) can be used to obtain crack arrest data high in the ductile-to-brittle transition of ferritic structural steel using dynamic computational techniques if a thermal gradient is utilized to aid in the crack arrest. Testing has been reported on two important navy structural steels that clearly defines the relative capability of the two materials to arrest rapidly growing cracks. The HY100 material demonstrated the expected large difference between the initiation and crack arrest toughnesses which has made it impossible in the past to measure crack arrest toughness for this material using the standard ASTM procedure (E1221). The HSLA-100 steel, however demonstrated a much higher crack arrest toughness and a correspondingly smaller drop in toughness below the initiation toughness. This small difference between initiation toughness and arrest toughness suggested that the E1221 procedure, using wedge loaded, compact crack arrest (CCA) specimens would be applicable to this material. Two important issues could then be investigated using this material. First, having completed the expensive and relatively complex testing of the SE(T) specimens using tensile loading and a thermal gradient, a second, quite different geometry could be tested using the E1221 procedure, allowing an important comparison between the crack arrest measurements made using these two distinct geometries. Historically, obtaining crack arrest results using one test configuration has been so difficult, that there have been very few reports of results for the same material using two different test geometries. Transferability of the laboratory results to structural applications has thus been a matter of conjecture. Furthermore, if the E1221 CCA specimens were strain gaged to obtain crack velocity data, and analyzed using the dynamic computational procedure used by Link on the SE(T) specimens, it would be possible to compare the results the E1221 static analysis with the results of the dynamic computation procedure to determine the degree of conservatism present in the E1221 standard procedure.The results of this work have shown that the crack arrest toughness results obtained on these two specimen geometries are similar and hence insensitive to the test geometry and the difference resulting from the application of the complex dynamic computational procedure or the E1221 static analyses is small. 相似文献