Kinetic Laws of Heating Initiated Reactions for Materials in Aerospace Applications

来源 :中国航天(英文版) | 被引量 : 0次 | 上传用户:wiqjhag
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Cure and decomposition reaction kinetics of typical organic materials in aerospace applications are intro-duced. From the data of dynamic differential scanning calorimetry (DSC) experiments, and based on changes of the peak temperatures (Tp) with different heating rates (β), a linear equation, Tp=T1+?Tlnβ, has been obtained more rea-sonably. The above equation can be used to explain some laws of higher or lower of apparent activation energies (Ea), by which the apparent activation energy (Ea) is nearly equal to RT12/?T. A number of kinetic investigations of typical thermosetting resins and energetic materials in aerospace applications were chosen to validate the above equations.
其他文献
In the recovery process of the reusable rocket with vertical take-off and landing, it has to go through the active control process, such as power drop, hover and vertical landing. The key technology lies in the development of high-precision vertical recov
通过对大连湾海底隧道建设工程干坞子项工程-防波堤工程高低基础沉箱间隔安装施工,明确了各工序施工所采取的相应技术质量控制措施及合理的施工顺序.结果 表明:通过采取相应的技术质量控制措施及合理安排各工序的施工顺序,西防波堤高低基础沉箱一次性安装成功.
大连湾海底隧道建设工程中预制及现浇沉管、沉箱、胸墙等结构形式复杂多样,并且结构断面尺寸大、模板需用量多.传统桁架结构钢模板结构设计繁琐、改制成本大、耗时长,而且存在周转通用性差、不易存放和保养等问题.现提出并使用一种适应不同结构施工的大型组合式钢模板,在实际施工应用中验证了其方便安装及拆分组合,可满足在各类预制及现浇混凝土结构间的周转使用.
Noise characteristic is one of the important factors to be considered during the design of a launch vehicle system. In this paper, the acceptance conditions for the external noise environment of the instrument cabin are given based on multi-source data, i
全回转钻机适用于复杂地质情况钻孔施工,相对于传统旋挖钻及冲击钻,具有桩身垂直度控制较好、施工灵活等优点.通过在大连湾海底隧道沉管预制场咬合桩止水施工应用可知,全回转钻机可驱动套管做360°回转,压入套管和挖掘同时进行,无需依赖缓凝剂控制混凝土强度,并且不会出现由于单桩成桩时间过长,Ⅰ序桩混凝土强度过高导致无法进行Ⅱ序桩咬合施工的弊病,施工工效及质量均满足相关要求.
China\'s Chang\'e 3 (CE-3) and Chang\'e 4 (CE-3) missions made historic progress by sending rovers equipped with scientific instruments to the new sites on the nearside and farside of the moon, respectively. The same lunar penetrating radar (LPR) th
Human Mars exploration has significant values in terms of exploring extraterrestrial life, interplanetary im-migration, promoting science and technology development, and the progress of human society. This paper summarizes the research progress on human M
作为大连湾海底隧道建设工程沉管预制场的干坞子项工程,在工程建设前通过开展质量策划,对施工过程中的质量管理重难点进行分析,将施工人员质量意识和工程实体的止水体系、底板台座、排水体系作为质量管理重难点.重点阐述了施工过程中在体系建设、质量管理制度、关键点控制、通病治理等方面采用的保证措施、质量管控亮点及实施效果,为类似工程提供借鉴.
The indigenous developed global BeiDou Navigation System (BDS-3) was formally commissioned, mark-ing the completion of the three-step BDS development strategy, and a new era for BDS to better serve people from all walks of life. In this paper, the recent
排水泵房用于坞室内向坞室外排水,由排水前池、泵房沉箱和胸墙组成,采用原位现浇施工方式.排水泵房由于结构形式复杂、高度大,施工难度较大.文中论述了分层现浇排水泵房的施工顺序及钢筋、模板、混凝土施工工艺,实施结果表明,施工分层合理、操作便捷、效率高,功能和质量满足设计要求.