矿石冲击下自卸汽车车箱底板纵横梁开裂和断裂原因分析

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (1) : 92-96.

论文

矿石冲击下自卸汽车车箱底板纵横梁开裂和断裂原因分析

朱龙龙1; 刘大维1; 王锋1; 程晓东2

作者信息 +

Cause analysis on vertically and horizontally beams of bodies floor cracking and rupture of dump truck by the ore impact

ZHU Long-long1; Liu Da-wei1; Wang Feng1; Cheng Xiao-dong2

Author information +

文章历史 +

摘要

针对重型自卸汽车车箱在装载矿石过程中出现的车箱底板纵横梁异常开裂和断裂问题，应用HyperMesh有限元软件建立了以板壳单元为基本单元的车箱有限元分析模型，并针对装载矿石的特点建立了矿石有限元模型，采用显式动态有限元法，以ANSYS/LS-DYNA为求解器，求解了不同质量的矿石从不同高度下落对车箱底板的冲击响应。结果表明：车箱底板纵横梁异常开裂和断裂是底板纵横梁连接部位冲击应力值大于材料的最小抗拉强度产生的，这与实车车箱底板纵横梁开裂和断裂情况相吻合。当车箱底板厚度为16mm，下落矿石质量超过0.3t之后，开裂和断裂处最大应力已大于底板材料的屈服强度（345 MPa）或最小抗拉强度（470 MPa）。为避免出现车箱底板大梁异常开裂和断裂现象，在确定的车箱底板厚度条件下，应限制装载矿石的质量和下落高度。

Abstract

This article aims to the issues of the vertically and horizontally beams of bodies floor cracking and rupture of heavy dump truck by the ore impact. The FEA model of dump truck was established by taking plate as basic element by using the so-called HyperMesh software, the FEA model of ore was established according to the loading characteristics, the explicit dynamic finite element method was applied by using ANSYS / LS-DYNA as solver and the impact response of different quality ore falling from different heights to the bodies floor of dump truck was solved. The results of our analysis indicate that: the vertically and horizontally beams of bodies floor abnormal cracking and rupture is that the impact stress value of floor joints on vertical and horizontal beams is greater than the minimum tensile strength of the material, and this is consistent with the actual situation of cracking and rupture. When the thickness of bodies floor is 16mm and the quality of falling ore is heavier than 0.3t, the maximum stress value of cracking and rupture is greater than the yield strength (345 MPa) or minimum tensile strength (470 MPa) of the material. To avoid the phenomenon of vertically and horizontally beams of bodies floor abnormal cracking and rupture, we should limit the quality and falling height of the ore under the condition of the determined thickness of bodies floor.

导出引用

朱龙龙;刘大维;王锋;程晓东. 矿石冲击下自卸汽车车箱底板纵横梁开裂和断裂原因分析[J]. 振动与冲击, 2012, 31(1): 92-96

ZHU Long-long;Liu Da-wei;Wang Feng;Cheng Xiao-dong . Cause analysis on vertically and horizontally beams of bodies floor cracking and rupture of dump truck by the ore impact [J]. Journal of Vibration and Shock, 2012, 31(1): 92-96