厚壁焊管強(qiáng)度在壁厚方向分布規(guī)律的研究
Study on Laws of Radial Strength Distribution of Heavy-wall Weld Pipe
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摘要: 通過對(duì)厚壁焊管內(nèi)、外表面及中部不同加工位置的圓棒試樣進(jìn)行力學(xué)性能試驗(yàn)，分析強(qiáng)度、包辛格效應(yīng)在壁厚方向上的分布規(guī)律。結(jié)果表明：對(duì)于縱向圓棒試樣，加工位置在焊管外表面的試樣的屈服強(qiáng)度最高，內(nèi)表面最低，中部略高于內(nèi)表面；對(duì)于橫向圓棒試樣，不同試樣加工位置的包辛格效應(yīng)基本相同。為了保證試驗(yàn)數(shù)據(jù)的一致性和科學(xué)性，建議在標(biāo)準(zhǔn)中明確規(guī)定厚壁焊管圓棒試樣的加工位置為壁厚中部位置。Abstract: The laws of radial distributions of strength and Bauschinger effect of the heavy-wall weld pipe are analyzed by means of conducting various mechanical tests with round bar specimens processed with samples cut from inner and outer surfaces and middle-wall section of the pipe.Results from the longitudinal testing with round bar specimens shows that the outer surface specimen has the maximum yield strength，the inner surface specimen has the minimum，and the middle-wall section specimen has the yield strength a little bit higher than that of the inner surface one.As for the transversal testing with round bar specimens，the results indicate that specimens cut from different locations of the pipe have almost the same Bauschinger effects.To ensure the consistency and scientificalness of the test data，it is suggested that it be expressively specified in the applicable specification that the round bar test specimens of the heavy-wall weld pipe shall be cut from the middle-wall location.
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