精纺毛花呢低应力性能与省道外观造型的关系

研究精纺毛花呢低应力性能与省道外观造型的关系．用正交试验法设计实验，选择服装工艺以确定适合于精纺毛花呢的最佳省道版型．利用数理统计方法确定省道外观造型与织物低应力性能的综合回归关系（使用KES－F和FAST织物风格测试系统测试），确立了2个回归方程．实验结果表明，织物低应力性能是决定服装外观造型的主要因素之一．

家庭洗涤对不同抗皱整理的POLO衫性能影响研究

为探究洗涤周期对不同抗皱整理的纯棉POLO衫的穿着舒适性和低应力力学性能的影响,选择未经抗皱整理剂整理和经过传统疏水抗皱整理剂整理、新研发的亲水抗皱整理剂整理的纯棉POLO衫作为研究载体,再通过对其进行不同洗涤周期的洗涤处理,详细探讨反复洗涤对其动态水传递速率、织物冷暖感、空气渗透阻力、拉伸延伸率、剪切刚度、剪切滞后力、厚度、MIU系数等性能影响趋势,并对其结果进行机理解释。结果表明:抗皱整理可显著降低由于反复洗涤造成的织物力学性能下降的程度。具体来说,相比于未经抗皱整理的POLO衫,经过抗皱整理的POLO衫的表面水分吸收率、冷暖感和低应力力学性能随洗涤周期增加变化不大;但经过抗皱整理后POLO衫的拉伸延伸率显著下降。此外,还发现:经过亲水性抗皱整理的POLO衫的表面吸水速率显著提高,但其亲水性柔软剂的耐洗性稍微下降,故今后研究应当进一步提高其耐洗性性能。可为人们日常衣物护理提供指导及后整理工艺优化提供参考。

Hot deformation behaviors and flow stress model of GCr15 bearing steel

The hot deformation behaviors of GCr15 bearing steel were investigated by isothermal compression tests, performed on a Gleeble-3800 thermal-mechanical simulator at temperatures between 950 ℃ and 1 150 ℃ and strain rates between 0.1 and 10 s-1. The peak stress and peak strain as functions of processing parameters were obtained. The dependence of peak stress on strain rate and temperature obeys a hyperbolic sine equation with a Zener-Hollomon parameter. By regression analysis, in the temperature range of 950-1 150 ℃ and strain rate range of 0.1?10 s?1, the mean activation energy and the stress exponent were determined to be 351kJ/mol and 4.728, respectively. Meanwhile, models of flow stress and dynamic recrystallization (DRX) grain size were also established. The model predictions show good agreement with experimental results.