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首页> 外文期刊>Multidiscipline modeling in materials and structures >Quantification of elastic stresses for structurally distorted 90° very thin-walled pipe bends under in-plane bending
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Quantification of elastic stresses for structurally distorted 90° very thin-walled pipe bends under in-plane bending

机译：在面内弯曲下，在结构上变形的弹性应力的定量为90°非常薄壁管弯曲

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Purpose - Elastic stress solutions are required in the field of fracture mechanics and the analysis of creep failure. The published precise elastic solutions are not addressing the influence of the manufacturing process induced, inevitable cross sectional deviations called ovality and thinning. The influence of ovality on plastic limit and collapse loads are reported in literature. Hence, it is important to study the combined effect of ovality and thinning on elastic stresses of bends. Design/methodology/approach - This paper relies on elastic finite element evolutions of stress components- longitudinal membrane stress, longitudinal bending stress, circumferential membrane stress and circumferential bending stresses. Based on the results, the coefficients for the equations are also obtained through the regression analysis. Findings - New analytical solutions are prescribed to estimate the elastic stresses at the mid-section of the 90° very thin-walled bend with ovality and thinning, when subjected to in-plane bending moment. The ovality has significant influence on elastic stress whereas the thinning is not so. The proposed equations give an accurate estimation of elastic stresses at the mid-section of the bend with the incorporation of the parameters, namely R/γ_m , γ_m/t and ovality. Research limitations/implications - The influence of shape imperfections, namely ovality and thinning on elastic stress of 90° very thin-walled bends having γ_m/t > 20, subject to in-plane bending moment is proposed. Originality/value - The influence of shape imperfections, namely ovality and thinning, on elastic stress of 90° very thin-walled bends with γ_m/t > 20, subject to in-plane bending moment is proposed.
机译：目的 - 裂缝力学领域需要弹性应力解决方案及蠕变失效分析。公布的精确弹性解决方案没有解决诱导的制造过程的影响，不可避免地横截面偏差被称为椭圆形和变薄。文献报道了椭圆度对塑料极限和塌陷载荷的影响。因此，研究椭圆度和稀疏对弯曲弹性应力的综合作用非常重要。设计/方法/方法 - 本文依赖于应力分量的弹性有限元演化，纵向弯曲应力，周向膜应力和周向弯曲应力。基于结果，通过回归分析也获得了方程的系数。调查结果 - 规定了新的分析解决方案，以估计90°的中间部分的弹性应力，其具有椭圆形和稀疏，当受到面内弯矩时。椭圆度对弹性应力产生了重大影响，而稀疏则不是如此。所提出的方程在弯曲的中间部分提供了对弯曲的中间部分的精确估计，即掺入参数，即R /γ_M，γ_M/ T和椭圆形。研究限制/影响 - 提出了形状缺陷，即椭圆形和稀疏对具有γ_m/ t> 20的90°非常薄壁弯曲的弹性应力的影响，受到在面内弯矩的影响。原创性/值 - 构造缺陷，椭圆形和稀疏的影响，提出了在与γ_m/ t> 20的90°非常薄的围墙弯曲的弹性应力下，受到在面内弯曲力矩的影响。

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