Abstract This paper investigates strain measured on the inside of an agricultural tyre with large tread-blocks during a series of static tests using a novel measuring system. The full field strain measurements may be used in the development of a tyre which is capable of estimating tyre forces from strain measurements. The strain measurement system makes use of a calibrated stereo camera system on a mechanical stabilizing system that keeps the cameras pointed at the inside surface of the tyre in contact with the road while the wheel rotates. A static tyre test rig is used to displace the road surface relative to the tyre in the vertical and longitudinal direction. The large tread-blocks caused strain concentrations on the inner surface as the tyre deforms to comply with the road surface. Vertical and longitudinal tests each produce unique strain patterns in the contact patch region. Relationships between the applied forces and strain measurements were developed and showed that these relationships are near linear with R2 values above 0.97. The strain measurements also show that the location where strain gauges, for single point strain measurements, are placed inside the tyre is very important on large lugged tyres.

中文翻译：

---

使用数字图像相关性对农用轮胎内部进行全场应变测量

摘要 本文研究了在一系列静态测试中使用新型测量系统在具有大胎面花纹块的农用轮胎内侧测量的应变。全场应变测量可用于开发能够根据应变测量估计轮胎力的轮胎。应变测量系统在机械稳定系统上使用经过校准的立体相机系统，该系统在车轮旋转时将相机对准轮胎的内表面并与路面接触。静态轮胎试验台用于在垂直和纵向方向上相对于轮胎移动路面。当轮胎变形以适应路面时，大的胎面花纹块导致内表面的应变集中。垂直和纵向测试各自在接触斑区域产生独特的应变模式。施加的力和应变测量之间的关系得到发展，并表明这些关系在 R2 值高于 0.97 时接近线性。应变测量还表明，用于单点应变测量的应变计放置在轮胎内部的位置对于大型带花纹的轮胎非常重要。