NUMERICAL SIMULATION OF AGRICULTURAL TIRE-SOIL CONTACT PROBLEM BY 3D FINITE ELEMENT METHOD

农业轮胎-土壤接触问题的3D有限元数值模拟

• 批准号: 03660260
• 负责人: NAKASHIMA Hiroshi
• 金额: $ 1.28万
• 依托单位: KYOTO UNIVERSIYT
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03660260/
• 关键词: Finite Element Method; Three-dimensional Contact Analysis; Tire Model; Soil Model; Penalty Formulation; Contact Element; Static Analysis; 3次元接触解析; ペナルティ法; タイヤ-土系; 特殊接触要素; 3次元接触問題; タイヤー土系; タイヤモデル; デ-タ作成法; 3次元弾性有限要素法; 一般化たわみチャ-ト; 逆解析

In this project, we focused on the development of numerical simulation method for three-dimensional tire-soil contact problems by the combination of tire model and soil model. We obtained the results : 1. The three-dimensional tire model which has already been developed by Nakashima and Wong can be included in the developed contact program if the elastic properties of tire is already known by TRAC procedure ; 2. As the three-dimensional soil model, Mohr-Coulomb elasto-Plastic model is considered with the initial strain method where the visco-plastic approach is employed ; 3. Contact check strategy used in the current program for contact analysis is found to work with sufficient accuracy when applied to three-dimensional Hertz contact problem. The result of two types of contact element shows the similar behavior of contact pressure distribution ; 4. As the first step verification of current three-dimensional tire-soil contact program, we analyzed the static sinkage of tire onto elastic soil. The obtained result shows the fundamental capability of three-dimensional elastic contact analysis of tire and soil system ; 5. If appropriate modification is further applied, our numerical method will be an effective tool when applied in practical field problems such as soil compaction. Moreover, it turned out that the computation is only possible by using a super computer for tire-soil contact analysis.

本课题重点发展轮胎模型与土壤模型相结合的三维轮胎-土壤接触问题的数值模拟方法。我们得到的结果是：1。如果通过TRAC程序已经知道轮胎的弹性特性，则可以将Nakashima和Wong已经开发的三维轮胎模型包含在开发的接触程序中；2. 作为三维土体模型，采用初始应变法考虑莫尔库仑弹塑性模型，采用粘塑性方法；3. 在当前接触分析程序中使用的接触检查策略在应用于三维赫兹接触问题时具有足够的精度。结果表明，两种接触单元的接触压力分布特征相似；4. 作为现有三维轮胎-土接触程序的第一步验证，我们分析了轮胎在弹性土上的静沉降。所得结果显示了轮胎与土壤系统三维弹性接触分析的基本能力；5. 如果进一步进行适当的修正，我们的数值方法将是应用于土壤压实等实际问题的有效工具。此外，结果表明，只有使用超级计算机进行轮胎-土壤接触分析才能进行计算。