CAJ | 학술논문

通过小孔模具成型并在升温固化前对纤维束加捻的方法制备了5种捻度（捻度t分别为1、2、2．5、3和4 n／cm）的z?pin。观察了各种捻度z?pin的外观形态，测试了各种z?pin的拉伸性能。通过单根z?pin从层合板中拔出的试验方法表征了z?pin与层合板之间的界面粘结性能。结果表明，加捻使z?pin主干发生扭曲，捻度越大，扭曲的程度越大；加捻使z?pin的拉伸强度及伸长率降低了50％左右，使拉伸模量降低了30％左右；加捻可显著提高z?pin与层合板之间的界面粘结性能，捻度越大，界面剪切强度τd、最大摩擦力Ff、拔出功Wp 越大；随着捻度的增大，z?pin与层合板间脱粘位置逐渐从z?pin自身的纤维与树脂之间的F?R型细观界面向z?pin外层树脂与层合板树脂之间的R?R型细观界面转移。当捻度t＝3 n／cm时，与无捻z?pin相比，τd 提高了61％，Ff 和Wp 均提高了2倍。
통과소공모구성형병재승온고화전대섬유속가념적방법제비료5충념도（념도t분별위1、2、2．5、3화4 n／cm）적z?pin。관찰료각충념도z?pin적외관형태，측시료각충z?pin적랍신성능。통과단근z?pin종층합판중발출적시험방법표정료z?pin여층합판지간적계면점결성능。결과표명，가념사z?pin주간발생뉴곡，념도월대，뉴곡적정도월대；가념사z?pin적랍신강도급신장솔강저료50％좌우，사랍신모량강저료30％좌우；가념가현저제고z?pin여층합판지간적계면점결성능，념도월대，계면전절강도τd、최대마찰력Ff、발출공Wp 월대；수착념도적증대，z?pin여층합판간탈점위치축점종z?pin자신적섬유여수지지간적F?R형세관계면향z?pin외층수지여층합판수지지간적R?R형세관계면전이。당념도t＝3 n／cm시，여무념z?pin상비，τd 제고료61％，Ff 화Wp 균제고료2배。
Five types of twisted z?pins( the twist degree are 1, 2, 2.5, 3 and 4 n/cm respectively) were prepared by means of draw forming from small?cavity mold and twisting before resin curing. Appearances of various twisted z?pins were observed, and the tensile properties of various twisted z?pins were tested. The interfacial adhesive properties between z?pins and laminates were charac?terized through single z?pin pull?out tests. The results show that twisting makes the stems of the z?pins distorted, the more twist de?gree is, the more distortion is. Twisting makes the tensile strength and the elongation reduce by about 50%, and the tensile modulus decreases by 30%. However, twisting improves the interfacial adhesive properties between z?pins and laminates significantly. The more the twist degree is, the higher the interfacial sheer strength τd, the maximum frictional force Ff, and the pull?out energy Wp are. With the increase of twist degree, the debonding location shifts from the F?R meso?interface between its fiber and resin of z?pin to the R?R meso?interface between the outer resin of z?pin and the resin of laminates. For the z?pin with twist degree of 3 n/cm, theτd is improved by 61%, Ff and Wp are all tripled.