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首页> 外文期刊>International Journal of Solids and Structures >Effect of notch depth on strain-concentration factor of rectangular bars with a single-edge notch under pure bending
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Effect of notch depth on strain-concentration factor of rectangular bars with a single-edge notch under pure bending

机译：切口深度对纯弯曲单边切口矩形钢筋应变集中系数的影响

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The FEM is employed to study the effect of notch depth on a new strain-concentration factor (SNCF) for rectangular bars with a single-edge notch under pure bending. The new SNCF K-epsilon(new) is defined under the triaxial stress state at the net section. The elastic SNCF increases as the net-to-gross thickness ratio h(0)/H-0 increases and reaches a maximum at h(0)/H-0 = 0.8. Beyond this value of h(0)/H-0 it rapidly decreases to the unity with h(0)/H-0. Three notch depths were selected to discuss the effect of notch depth on the elastic-plastic SNCF; they are the extremely deep notch (h(0)/H-0 = 0.20), the deep notch (h(0)/H-0 = 0.60) and the shallow notch (h(0)/H-0 = 0.95). The new SNCF increases from its elastic value to the maximum as plastic deformation develops from the notch root. The maximum K-epsilon(new) of the shallow notch is considerably greater than that of the deep notch. The elastic K-epsilon(new) of the shallow notch is however less than that of the deep notch. Plastic deformation therefore has a strong effect on the increase in K-epsilon(new) of the shallow notch. The variation in K-epsilon(new) with M/M-Y, the ratio of bending moment to that at yielding at the notch root, is slightly dependent up to the maximum K-epsilon(new) for the shallow notch. This dependence is remarkable beyond the maximum K On the other hand, the variation in K-epsilon(new) with M/M-Y is independent of the stress-strain curve for the deep and extremely deep notches. (c) 2005 Elsevier Ltd. All rights reserved.
机译：有限元法用于研究切口深度对纯弯曲下具有单边缘切口的矩形钢筋的新应变集中系数（SNCF）的影响。新的SNCFK-ε（new）在净截面处在三轴应力状态下定义。弹性SNCF随着净毛厚度比h（0）/ H-0的增加而增加，并在h（0）/ H-0 = 0.8时达到最大值。超过此值h（0）/ H-0，它迅速减小到与h（0）/ H-0相同。选择三个缺口深度以讨论缺口深度对弹塑性SNCF的影响;它们是极深的切口（h（0）/ H-0 = 0.20），深的切口（h（0）/ H-0 = 0.60）和浅的切口（h（0）/ H-0 = 0.95） 。随着槽口根部塑性变形的发展，新的SNCF从其弹性值增加到最大值。浅凹口的最大Kε（新）大大大于深凹口的K。但是，浅槽口的弹性Kε（新）小于深槽口的弹性Kε。因此，塑性变形对浅切口的K-ε（新）的增加有很大影响。 K-ε（新）随M / M-Y的变化（弯矩与凹口根部屈服时的弯矩之比）与浅凹口的最大K-ε（新）有关。这种依赖性远远超过了最大K。另一方面，K-ε（新）随M / M-Y的变化与深和极深槽口的应力-应变曲线无关。 （c）2005 Elsevier Ltd.保留所有权利。

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