摘要
为了探索Glare层板的成形性能特点,采用单向拉伸实验和三点弯曲实验,分析研究了Glare 2A,Glare 2B和Glare 3层板的基本成形性能,并借助扫描电子显微镜分析了Glare层板的失效特征。结果表明:纤维铺层方向对材料的成形性能存在显著影响,Glare 2A层板抵抗塑性变形的能力强,且难以发生厚向变形:采用σ=σy+Kεn硬化模型拟合真实应力-应变曲线,其相关系数最大,拟合结果最好:Glare 2A的弯曲回弹量最大,其弯曲破坏时,内表层受压应力,以皱缩和压缩断裂为主,外表层受拉应力,以纤维拉伸断裂和分层为主;对于Glare 2B层板,其弯曲回弹量最小,主要以基体破坏为主:通过滚弯成形验证了实验所得结果的准确性。
The basic formability of Glare 2A,Glare 2B and Glare 3 laminates was investigated by unidirectional tensile and three-point bending tests to explore the formability characteristics of Glare. Meanwhile,the failure characteristic of Glare was studied by scanning electron microscopy（SEM）. The results indicate that the direction of the fiber has strong effects on the formability of Glare. The Glare2 A laminates exhibit the strongest resistance to plastic deformation. Meanwhile,it is also hard to deform in thickness direction. σ = σy＋ Kε^n is used to fit the real stress-strain curves of three variants and proves the most suitable model,presenting the maximum correlation coefficient. Furthermore,Glare 2A laminates exhibit the most serious bending springback. Shrinkage and compression fracture are visible in the inner layer which bears compressive stress,and fiber fracture and delamination are found in the outer layer which bears tensile stress. On the contrary,Glare 2B laminates show the minimum springback,following with the observed fiber-matrix cracks. Finally,the accuracy of test results is verified by roll bending.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2017年第1期86-92,共7页
Journal of Aeronautical Materials
基金
国家商用飞机制造工程技术研究中心创新基金资助项目(SAMC 13-JS-15-032)
江苏省普通高校研究生科研创新计划资助项目(KYLX_0259)
江苏省先进结构材料与应用技术重点实验室开放基金资助项目(ASMA201401)
国家级大学生创新创业训练计划资助项目(201510287033)
江苏高校优势学科建设工程资助项目(PAPD)
