共查询到17条相似文献,搜索用时 140 毫秒
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通过建立粘扣带单钩剪切力力学模型,推导出整片粘扣带剪切强度力学模型,得到粘扣带剪切强度计算式;按照理论剪切强度相对于实际剪切强度的偏差百分率不大于5%,对单位面积钩的密度、钩挂率、修正系数人为取值,得到粘扣带剪切强度的计算式,即剪切强度与粘扣带钩的直径的关系式。在有限范围内可以用于粘扣带剪切强度的计算和预测。 相似文献
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粘扣带剥离强度力学模型研究 总被引:1,自引:0,他引:1
通过建立粘扣带单钩剥离强力力学模型,推导出整片粘扣带剥离强度力学模型,得到粘扣带剥离强度计算式;按照理论剥离强度相对于实际剥离强度的偏差百分率不大于5%,对单位宽度钩的密度、钩挂率、修正系数人为取值,从而得到粘扣带剥离强度的简单计算式,即剥离强度与粘扣带钩的直径的关系式,在有限范围内可以用于粘扣带剥离强度的计算和预测。 相似文献
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主要通过沙发弹簧座垫在垂直载荷作用下的变形挠度测量,建立沙发座垫力学行为的模型,并进行了验证。研究结果表明:载荷(增量)越小,沙发座垫实测挠度与模型计算理论值越接近,这就说明该力学模型可以为沙发座垫结构与性能的改进提供一定的理论依据。 相似文献
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研究了用含纳米碳粉树脂对锦纶粘扣带进行的抗静电涂层整理工艺,硫酸铜抗静电剂对锦纶粘扣带进行的抗静电浸渍整理工艺,以及耐洗涤强化工艺,结果显示:用6%(相对混合物质量的百分数)的纳米碳粉对粘扣带进行涂层,粘扣带底布的表面电阻达到104Ω;浸渍整理时,浸渍温度40℃、浸渍时间12h,毛面粘扣带的表面电阻达到105Ω;浸渍整理后,洗涤5次,毛面粘扣带表面电阻达到109Ω,洗涤6次,表面电阻上升到1010Ω;而经耐洗涤强化工艺后,洗涤6次,毛面粘扣带表面电阻为109Ω,能达到抗静电要求,但耐洗涤次数提高有限。 相似文献
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在对钩毛搭扣带的物性指标和产品标准进行探讨和分析的基础上,指出试图制定一套适合所有行业和用途的钩毛搭扣带的统一或所谓权威的产品标准是不合逻辑的,也不具实际意义。随着科技的发展,钩毛搭扣带的产品系列和应用也在不断发展。在选择钩毛搭扣带产品时,用户应根据实际应用的需要选择合适的钩毛搭扣带产品组合,并确定合理的物性指标和相应的产品标准,这样能够取得事半功倍的效果。 相似文献
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风电用与钢结构用高强度紧固件的差异 总被引:1,自引:0,他引:1
风电用和钢结构用高强度紧固件常用标准都为9个。风电用和钢结构用高强度螺栓强度级别都选择10.9级,但风电用高强度螺栓HRC值32~39,抗拉强度≥1 040 MPa,断后伸长率≥9%,断后收缩率≥48%,低温冲击功AKV(-40℃)≥27J;钢结构用高强度螺拴HRC值33~39,抗拉强度1 040~1 240 MPa,断后伸长率≥10%,断后收缩率≥42%,冲击功AKu2≥47J。比较风电用与钢结构用高强度螺栓材料选用方面的差异。表面处理工艺,风电用高强度紧固件采用喷丸和非电解达克罗涂层;钢结构用高强度紧固件用磷化、发黑和磷皂化工艺。比较风电用和钢结构用高强度紧固件生产工艺与包装方式的差异。建议制订风电紧固件行业标准,以促进风电设备的全面创新。 相似文献
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Edge curling is a unique property of knitted fabrics which affects on fashion such as using upper and side curling in cloth design. The purpose of this research is to present a new method to simulate drape behavior of knitted fabric considering difference between single and double jersey knitted fabrics. To this point, at first the bending and torsion moments that applied on the fabric edges and caused curling in single knitted fabric are determined. Also it demonstrated that these moments will be neutralized in double knitted and as the results, leads to a non-curling structure. Then, using the mass spring model, curling shape in fabric wale and course directions are simulated. To show efficiency of the proposed model, real 3D shape of single knitted fabric is compared with experimental results. Also, using the proposed model, the drape behaviors of single and double jersey knitted fabrics hanging from two fixed corners with different properties are simulated and then extend to simulation of skirt. Results of simulation are compared with 3D shapes of actual drape behavior in fabric samples which are achieved by depth camera. The simulated results show good agreement with 3D shapes of actual fabrics. 相似文献
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Seam strength prediction using loop strength has been found to be more accurate and has been consistently used by researchers over last few decades. But the testing gauge length for loop strength has not been standardized as in the case of thread tensile strength. In this paper, effect of gauge length on thread tensile strength and elongation in loop form and straight form has been studied. 40 tex and 60 tex mercerized cotton and spun polyester threads are used for the study. It is observed that there is no significant change in the loop strength of the threads as the gauge length increases, whereas the tensile strength of all threads decreases with the increase in gauge length. Elongation % is found to change significantly in both loop and straight form during tensile testing. Therefore, it is concluded that loop strength tests can be carried out at any gauge length unlike tensile testing of straight threads. 相似文献