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无论是检测管道静液压强度和预测管道寿命,还是进行管道的规格选型,都离不开数学计算,因此对于塑料压力管道设计师而言,了解和掌握塑料压力管道系统计算基础显得尤为必要。[编者按] 相似文献
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分析了引起塑料压力管道发生力学破坏的各种影响因素,指出了快速应力开裂的危害性;概述了国内外塑料压力管道快速应力开裂研究的各种实验方法,并分析了各种方法的优缺点,对其发展方向进行了预测。 相似文献
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近日,欧洲生物塑料协会和欧洲多糖卓越网(EPNOE)联合发布了一份关于生物基塑料的研究调查报告,对生物基塑料的材料特性和生产过程进行了详细研究,并对生物基塑料的技术开发能力和市场前景进行了预测。这份研究报告称,生物基塑料的生产技术体系在5年前就已确立,随着相关材料和生产技术的发展科印精品调研, 相似文献
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21世纪初我国塑料加工工业发展前景展望 总被引:3,自引:0,他引:3
从塑料材料生产需求水平,技术特点,发展方向以及塑料在包装,建筑、汽车、电子电气、农业、医疗卫生、文体等方面的应用,对我国21世纪初塑料加工业科技发展前景进行了预测和展望。 相似文献
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塑料自然老化力学性能的人工神经网络预测 总被引:2,自引:0,他引:2
针对塑料老化过程,利用人工神经网络方法建立自然老化力学性能时间序列的预测模型。该模型可很好地解决老化试验中数据少且统计规律不明显的问题。从给出的拉伸强度和断裂伸长率的预测例子和计算结果表明,该方法具有良好的精度,可满足工程实际对塑料老化性能预测精度的要求。同时可大量缩短试验时间,节约试验费用。 相似文献
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该文较系统地讨论了作为塑料与树脂的着色剂的有机颜料,重点介绍了塑料、树脂对着色剂性能的要求,适用于塑料着色的有机颜料类型,有机颜料制备物。介绍了树脂着色的相关颜料表面的改性技术与特定聚合物表面活性剂的处理方法。 相似文献
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该文较系统地讨论了作为塑料与树脂的着色剂的有机颜料,重点介绍了塑料、树脂对着色剂性能的要求,适用于塑料着色的有机颜料类型,有机颜料制备。介绍了树脂着色的相关颜料表面的改性技术与特定聚合物表面活性剂的处理方法。 相似文献
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抗菌塑料的制备及应用研究进展 总被引:2,自引:1,他引:1
概述了抗菌塑料中使用的抗菌剂及其抗菌机理,以及抗菌塑料的制备。介绍了目前普遍采用的一些评价抗菌性能的方法。就目前抗菌塑料研究中存在的问题提出了解决办法,并对抗菌塑料的发展进行了展望。 相似文献
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该文较系统地讨论了作为塑料与树脂的着色剂的有机颜料,重点介绍了塑料、树脂对着色剂性能的要求,适用于塑料着色的有机颜料类型,有机颜料制备物。介绍了树脂着色的相关颜料表面的改性技术与特定聚合物表面活性剂的处理方法。 相似文献
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With plastics being increasingly applied to moving parts today, predictions of continuous fatigue life under identical conditions (ambient temperature, frequency and load stress) are not sufficient. Rather, there is an urgent need to develop a method of predicting fatigue life under multi-stage loading involving intermittently changing conditions. In this study, by applying a temperature- and frequency-superposition method to fatigue life prediction of plastics, it was found that an exponential type of cumulative damage law could be applied to a two-stage fatigue process. Specifically, when fatigue conditions (interval time, ambient temperature, frequency and load stress) are changed between several stages, the resulting damage behavior follows an exponential law representing the ratio of the number of cycles in each stage to the continuous fatigue life under those conditions. It is shown here that the exponent m has a single value and consists of the product of the independent functions of the factors of the fatigue conditions. It is also shown that the use of this exponential law reproduces very well the damage behavior in a two-stage fatigue test in which each fatigue condition is changed and in three- and four-stage fatigue tests in which the interval time is varied. 相似文献
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主要介绍了J积分表征聚合物断裂韧性的基本原理、在塑料研究中的应用以及J积分数值的处理方法,阐明了J积分作为塑料断裂韧性参数的意义和用途。 相似文献
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Gear pump assisted extrusion is becoming popular in the plastics processing industries. The growth has been tremendous since 1980. In this study, the benefits of gear pump assisted extrusion, especially in single screw applications, is critically reviewed, and a method of predicting the operational conditions of the gear pump assisted extrusion system is discussed. Further, shortening the length to diameter ratio of the extruder in gear pump assisted extrusion was analyzed and found to produce a reduction in energy consumption, provided melting is completed. 相似文献
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Fujio Ohishi 《应用聚合物科学杂志》1970,14(9):2225-2237
This work was undertaken to measure quantitatively the quality change and crack development caused by degradation of plastics with the new photoelastic scale (P scale) using split circular ring-type specimens (C specimen). For an example, a polycarbonate specimen was used under various conditions—photodegradation, thermal degradation, solvent cracking, solvent action, and alkaline degradation. The results indicate that this method is useful for evaluating durability of plastics, and a merit of the method is to provide quick, convenient, nondestructive means of measurement with simple equipment. Besides, this C specimen is easily deflected by a spring plate with two holes. Therefore this method is also applicable to the investigation of effects of deformation on various degradations of plastics. 相似文献
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针对在采暖系统中日益广泛使用的新型塑料管材,试探讨适合不同热力工况的塑料管材使用寿命的计算方法,也是工程设计中选用管材的一种可行的方法。同时推导出了计算逐时温度的计算式。指出了ISO标准建议采用的管系列并不完全适合我国不同地区采暖系统的原因及有关分析。 相似文献