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It is about 1000 MPa more than sample made with 31 seconds gas injection time, and much higher than rest of samples investigated during whole researches. That difference between samples no 13 and 14 decreasing in range of temperature form -50°C to +70°C, and above 70°C storage modulus (E’) (for investigated samples) maintain more or less the same value. Forgas injection time gas injection delay time melt temperature Shenyang Aerospace University (59.46.65.101) - 2014/3/25 Download 110 110 P. Postawa, T. Stachowiak, T. Jaruga Archives of Materials Science and Engineering mechanical properties of injection moulded parts, especially stiffness and density the biggest influence has post filling stage. In GAIM technology gas injection time has that same importance like hold pressure in conventional injection moulding technology. Using long time of post filling stage we can obtain better mechanical properties (stiffness and density) but to high gas injection time and gas pressure could have negative influence for residual stresses of mouldings [39-42]. 4. Conclusions Presented in the article investigations of dynamic mechanical properties by means of DMTA method are useful for interpretation of many phenomena which occur during polymer processing. The fact of existence of influence of used processing conditions on dynamical mechanical properties analysing use DMTA were presented.The most influence on dependence of the storage modulus E’and the mechanical loss factor tg􀄯 has gas injection time, and for this processing parameter observed differences was biggest. In the rest investigation we can see some differences too but its importance were much more smaller. The macromolecule packing density (dependent on gas injection time) influence on stiffness of moulded parts.The results and the methodology of the investigations are an example of use of methods of thermal analysis for qualitative assessment of the injection technology, especially in relation to industrial moulded pieces which have to meet high quality standards. That paper is only one of whole part of research regarding influence of processing condition on properties parts made using gas assisted injection moulding. Rest of results (mechanical properties: stiffness, hardness and other) will be compare with presented in present article. |
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reko34
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wanghaiju: 金币+29, 翻译EPI+1, ★★★★★最佳答案 2014-06-12 12:31:49
wanghaiju: 金币+29, 翻译EPI+1, ★★★★★最佳答案 2014-06-12 12:31:49
中间段格式乱了，突然插进下载信息，只能对单词硬翻。这文章的语法简直一坨屎，翻了一大半时才想到，LZ你是不是贴错文件了？ 比31秒气体注射制成的样件高1000MPa，比整个研究中的其余样件高得多。13和14号样件的区别在-50°C到+70°C之间减小，在70°C以上（所调查的样件的）储能模量(E’)大致维持相同的值。气体注射时间 气体注射延迟时间 熔化温度 沈阳航空航天大学(59.46.65.101) - 2014/3/25下载 110 110 P. Postawa, T. Stachowiak, T. Jaruga Archives of Materials Science and Engineering 后充填阶段对注塑件的机械特性，尤其是刚度和密度有最大的影响。凯武技术的气体注射时间与常规注射成型技术中的保持压力同样重要。 长时间的后充填阶段能得到较好的机械性能（刚度和密度），但高气体注射时间和气体压力可能对铸件的参与应力产生负面影响[39-42]。 4. 结论 文章通过DMTA法研究了动态机械性能，对解释聚合物加工中出现的很多现象有用。展示了通过DMTA分析加工条件对动态机械性能影响的结果。注塑时间对储能模量E’和机械损失系数的影响最大，在这个加工参数观察到的区别最大。其余的研究中也能看到区别但影响小得多。 高分子堆积密度（取决于气体注射时间）对铸件刚度有影响。研究的结论和方法是将热分析方法用于定性评价注塑技术的一个例子，尤其对需满足质量标准的工业铸件。 本文只是整个研究中关于加工条件对气体辅助注塑件性能影响的一部分。其余结果（机械性能：刚度、硬度等）将会和本文的内容对比。 |
2楼2014-06-12 11:14:48