基于硬度梯度的热成形高强钢弯曲性能研究

Bending Behavior Based on Hardness Gradient for Hot Forming High Strength Steel

摘要:

采用热成形高强度钢设计了不同厚度板料的三点弯曲试验，得到了相关弯曲力学性能参数。实验表明：热成形高强度钢的弯曲力学性能随厚度的增加而增强，在厚度方向上硬度分布呈中间高、两侧低的梯度分布规律，形成了具有连续梯度分布的多层金属复合材料。基于厚度方向硬度梯度分布规律及硬度-强度对应关系，建立了一种多层金属复合材料的三点弯曲数值仿真模型，研究了热成形板材在变梯度弯曲模型下更合理的数值模拟方法。

Abstract:

A three-point bending test of hot forming high strength steel specimens with different thickness was designed. The related mechanical parameters were obtained. The results indicated that the bending mechanical properties of hot forming specimens were strengthened with the increase of the thickness. The specimens which were based on different thickness had higher center hardness and lower surface hardness. Meanwhile, a multi-layer composite material was proposed with hardness gradient distribution in the direction of the thickness. Based on the hardness gradient and the hardness-strength corresponding to the relationship, a multi-layer gradient numerical simulation model of three-point bending was established, explored that the gradient material model was more rational for numerical simulation. 