功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2012年
19期
2671-2674
,共4页
田恒%王继辉%冀运东%胡海晓%张红元%徐喆
田恆%王繼輝%冀運東%鬍海曉%張紅元%徐喆
전항%왕계휘%기운동%호해효%장홍원%서철
布拉格光栅传感器%预浸料%热压罐成型%固化行为%残余应力
佈拉格光柵傳感器%預浸料%熱壓罐成型%固化行為%殘餘應力
포랍격광책전감기%예침료%열압관성형%고화행위%잔여응력
fiber Bragg grating sensors%prepreg%autoclave forming%cure behavior%residual stress
复合材料在固化过程中产生的残余应力会严重影响材料的使用和安全。首先在研究和测试了布拉格光栅温度和应力灵敏度的基础上,将3根光栅分别以平行于碳纤维的方向置入预浸料的上、中、下3个位置,以此获得复合材料不同厚度位置的残余应力变化情况。监测结果表明,上、下层光栅监测到的预浸料固化过程几乎完全一致,而在降温时下层的布拉格光栅残余应力则比上层的要大得多,中间层布拉格光栅在固化过程中测得的残余应力最小,但在降温过程中的热残余应力不易释放而导致最后的残余应力也较大。
複閤材料在固化過程中產生的殘餘應力會嚴重影響材料的使用和安全。首先在研究和測試瞭佈拉格光柵溫度和應力靈敏度的基礎上,將3根光柵分彆以平行于碳纖維的方嚮置入預浸料的上、中、下3箇位置,以此穫得複閤材料不同厚度位置的殘餘應力變化情況。鑑測結果錶明,上、下層光柵鑑測到的預浸料固化過程幾乎完全一緻,而在降溫時下層的佈拉格光柵殘餘應力則比上層的要大得多,中間層佈拉格光柵在固化過程中測得的殘餘應力最小,但在降溫過程中的熱殘餘應力不易釋放而導緻最後的殘餘應力也較大。
복합재료재고화과정중산생적잔여응력회엄중영향재료적사용화안전。수선재연구화측시료포랍격광책온도화응력령민도적기출상,장3근광책분별이평행우탄섬유적방향치입예침료적상、중、하3개위치,이차획득복합재료불동후도위치적잔여응력변화정황。감측결과표명,상、하층광책감측도적예침료고화과정궤호완전일치,이재강온시하층적포랍격광책잔여응력칙비상층적요대득다,중간층포랍격광책재고화과정중측득적잔여응력최소,단재강온과정중적열잔여응력불역석방이도치최후적잔여응력야교대。
Residual stress formed in the curing process can greatly affect the application and safety of composite material. In this paper, the temperature sensitivity and stress sensitivity of fiber Bragg grating (FBG) were firstly investigated, and then three FBG sensors parallelling to carbon fiber were embedded into different depth direction of composite material in order to in-situ monitor the changes of residual stress. The results show that change trends of the upper FBG sensor almost stay the same with the lower one, while the lower FBG sensor displays much more residual stress than the upper one at cooling stage. The middle FBG sensor experiences the least residual stress at curing process, but it has the major residual stress at last because of residual thermal stress existing.