摘要
低速冲击与集中准静态压痕(QSI)力对复合材料层合板所造成的损伤具有等效性。通过两类损伤方式对比试验,获得了冲击能量(或准静态压痕力)与层合板损伤面积、损伤宽度和凹坑深度3组对应关系。3组关系的对比分析表明,凹坑深度是表征损伤的最佳参数,因此将凹坑深度作为损伤参数来建立落锤冲击损伤与准静态压痕力损伤间的等效关系。发现拐点是层合板纤维和基体整体抵抗冲击(或准静态压痕力)能力的最大值,两类试验的拐点相差很小,且两类试验变化趋势相同,说明了用集中准静态压痕试验取代落锤低速冲击试验是可行的。对相同凹坑深度下的冲击能量与准静态压痕力进行了数值分析,并提出了冲击能量与准静态压痕力间的等效性公式。研究表明,文中建立的等效性公式能够很好地反映落锤冲击能量与准静态压痕力之间的关系,可为今后由集中准静态压痕试验代替落锤冲击试验提供理论支持。
Through a series of drop-weight impact tests and quasi-static indentation（QSI）tests of composite laminates,three kinds of relationships are obtained between the impact energy（or the quasi-static indentation force）and the damage area,damage width or dent depth.An analysis of these relationships indicates clearly that,as compared with damage area or damage width,the dent depth is the most appropriate parameter to describe the damage.Therefore,the dent depth is selected as the damage parameter to set up the damage relationship between drop-weight impact and quasi-static indentation.Knee-point means the maximal ability of damage resistance for drop-weight impact and quasi-static indentation,and the two knee-points are very close for the two types of tests,which suggests the feasibility for setting up an equivalent relationship between them.By numerical analysis of the impact energy and static indentation force under the same dent depth,a new equivalent formula is set up,which corresponds well with the results of the tests.And it may provide theoretical support for damage tests in future.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2010年第5期928-933,共6页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(10872167)
关键词
复合材料
层合板
冲击能量
准静态压痕力
凹坑深度
等效性公式
composites
laminates
impact energy
quasi-static indentation force
dent depth
equivalent formula
