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Thermomechanical Fatigue Life Investigation of an Ultralarge Mining Dump Truck Tire

机译：超大型矿用自卸车轮胎的热机械疲劳寿命研究

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摘要

The cost benefits associated with the use of heavy mining machinery in the surface mining industry has led to a surge in the production of ultra-large radial tires with rim diameters in excess of 35 in. These tires experience fatigue failures in operation. The use of reinforcing fillers and processing aids in tire compounds results in the formation of microstructural inhomogeneity in the compounds and may serve as sources of crack initiation in the tire. Abrasive material cutting is another source of cracks in tires used in mining applications. It suffices, then, to assume that every material plane in the tire consists of a crack precursor of some known size likely to nucleate under the tire's duty cycle loads. This assumption eliminates the need for prior knowledge of the location and geometry of crack features to be explicitly included in a tire finite element model, overcoming the key limitations of previous approaches.;In this study, a rainflow counting algorithm is used to consistently count strain reversals present in the complex multiaxial variable amplitude duty-cycle loads of the tire to assess fatigue damage on its material planes. A critical plane analysis method is then used to account for the non-proportional loading on the tire material planes in order to identify the plane with the highest fatigue damage. The size of the investigated tire is 56/80R63, and it is typically fitted to ultra-class trucks with payload capacities in excess of 325 tonne (360 short ton). Experimental data obtained from extracted specimens of the tire were used to characterize the stress-strain and fatigue behavior of the tire finite element model in ABAQUS. A sequentially coupled thermomechanical rolling analysis of the tire provided stress, strains, and temperature data for the computation of the tire's component fatigue performance in the rubber fatigue solver ENDURICA CL. The belt endings (tire shoulder), lower sidewall, and tread lug corners are susceptible to crack initiation and subsequent failure due to high stresses.;This pioneering research effort contributes to the body of knowledge in tire durability issues in relation to mining applications. In addition, it provides a basis for off-road tire compounders and developers to design durable tires to minimize tire operating costs in the mining industry.
机译：在露天采矿业中使用重型采矿机械所带来的成本优势导致轮辋直径超过35英寸的超大型子午线轮胎的生产激增。这些轮胎在操作中会出现疲劳故障。在轮胎胶料中使用增强填料和加工助剂会在胶料中形成微结构不均匀性，并可能成为轮胎中产生裂纹的来源。磨料切割是采矿应用中轮胎破裂的另一个原因。然后，假设轮胎中的每个材料平面都由某种已知尺寸的裂纹前体组成，该裂纹前体可能会在轮胎的工作负荷下成核，就足够了。这种假设消除了对轮胎特征的几何形状明确包含裂纹特征的位置和几何形状的先验知识的需要，从而克服了先前方法的关键局限性；在本研究中，使用雨流计数算法来一致地计算应变轮胎复杂的多轴可变振幅占空比负载中存在的逆转，以评估其材料平面上的疲劳损伤。然后使用临界平面分析方法来考虑轮胎材料平面上的非比例载荷，以便识别出疲劳损伤最高的平面。被调查轮胎的尺寸为56 / 80R63，通常适用于有效载荷超过325吨（360短吨）的超大型卡车。从提取的轮胎样本中获得的实验数据用于表征ABAQUS中轮胎有限元模型的应力应变和疲劳行为。轮胎的顺序耦合热机械滚动分析提​​供了应力，应变和温度数据，用于在橡胶疲劳求解器ENDURICA CL中计算轮胎的组件疲劳性能。带束末端（轮胎胎肩），下胎侧和胎面花纹角容易因高应力而导致裂纹萌生和随后的破坏。这项开创性的研究工作为有关采矿应用的轮胎耐久性问题提供了丰富的知识。此外，它为越野轮胎配混者和开发人员设计耐用轮胎提供了基础，以最大程度地降低采矿业的轮胎运营成本。

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  • 作者

    Nyaaba, Wedam.;

  • 作者单位

    Missouri University of Science and Technology.;

  • 授予单位 Missouri University of Science and Technology.;
  • 学科 Mining engineering.;Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 225 p.
  • 总页数 225
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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