Research On Energy Absorption And Transfer Of Textile Composites Under Low Velocity Impact

Human body damage accidents occur frequently caused by falling objects andtraffic accidents, so scholars pay great attention to the design of the protectivematerials of human. At present most scholars have done a lot of researches on damagefailure and energy absorption under low impact of textile composites, which revealsthe shock mode and mechanism of the textile composites. But scholars pay littleattention to the human body damages caused by the protection materials due to lessdesign for the transmission of shock energy. The author based on the human bodyinjuries and protections, explored energy absorption and transmission of textilecomposites in low speed shock, and then analyzed the textile composites’ energytransmission conditions of the opposite side under the shock.The author researched the wave transfer rule, the existing research methods andtesting equipment, and then designed the testing system on energy transmission andabsorption based on the existing defects and the insufficiency.The paper consists of four parts,(1)The author analyzed the shock wave transmission rule and its influencingfactors, and the form and the relationship of harm caused by shock to human body,designed a device which could collect data corresponding to the impact point and thedata of the opposite point after the shock, and then analyzed the feasibility of thedesigned instrument comprehensively.(2)The author integrated and debugged the testing instrument after each moduledesign of the instrument completed. Under different test conditions, the author testdifferent shocks, then made classified and regression analysis with the collected testdata, and compared the output waveform differences between the PVDF sensor and the standard sensor. The results shows that different impact energy and sensor outputvalue has obvious linear relationship, the output waveform of PVDF sensor andstandard sensor is consistent, and the test data is accurate and reliable. The author alsoadjusted the design instrument, which effective filtered external interference for theoutput signal from the electromagnetic wave to the instrument.(3)Based on the calibration of the instruments, the author tested on part of thematerials, and stated just relying on the sensor could not reflect human real stresscondition through the differences between the output value and waveform of thefluctuation sensor, which proved the design of testing instruments is reasonable andscientific.（4）The author made shock experiment on all sorts of materials and materialscomposition. Based on the data analysis, the author got the influence factors of theenergy transfer and absorption and put forth to some theoretical basis to improve theprotective performance of the protective equipment.