论文部分内容阅读
为了解木材横纹压缩的流变性能,例如在刨花板生产过程中热压时的行为,首先需要找出一种测定流变参数的方法。木材横纹压缩的流变性能相当复杂。在流变范围内,瞬间变形主要包含弹性变形和塑性变形;蠕变往往是由粘弹性函数和依赖于时间的塑性变形函数叠加而成。然而叠加的各流变参数可以用一种简单的方法将其——分离。由于各种流变参数和函数的叠加,在广泛的压缩应力范围内存在着五种不同形式的蠕变-回复曲线。
To understand the rheological properties of wood-grain compression, such as the behavior of hot-pressed particleboard, it is first necessary to find a way to determine the rheological parameters. The rheological properties of wood stripe compression are quite complex. In the rheological range, the instantaneous deformation mainly includes elastic deformation and plastic deformation; creep is often superposed by the viscoelastic function and the plastic deformation function dependent on time. However, the rheological parameters that are superimposed can be separated in a simple way. Due to the superposition of various rheological parameters and functions, there are five different forms of creep-recovery curves over a wide range of compressive stresses.