平接型双材料的载荷位移特征与界面失效机理研究
|
摘要
针对双材料界面强度不足与界面应力分布不均的问题,对双材料界面强度、界面应力分布不均、载荷位移曲线(LD)波动等方面进行了试验研究与理论分析,利用铝/聚乙烯(PE)、铝/聚丙烯(PP)、铝/聚甲醛(POM)双材料的实验结果,对材料的TS813粘结试样界面强度与Ergo5800粘结试样进行了比较分析,对弹性模量与PE、PP、POM材料的界面强度进行了对比,分析了载荷位移曲线与界面断口。研究结果表明:铝/非金属双材料界面抗拉强度随着弹性模量增大而减小,TS813试样界面强度为Ergo5800试样的4.44、2.17、2.89倍,铝/橡胶前者为后者76.47%;界面强度分布不均导致界面剥落情况不同与LD曲线中波动现象,同种材料试样与同种粘结剂试样,试样界面强度越低载荷波动越明显。
Aiming at the problems of insufficient tensile strength and uneven distribution of stress,the bi-material was experimental studied and theoretical analyzed in the areas of stress strength,stress distribution,load displacement curves,etc. Utilizing the result of the bi-material of Al/PE,Al/PE,Al/PE,the TS813 bonding samples and the Ergo5800 ones were compared. Then,comparing the elastic modulus and the interface strength of PE,PP,POM,the load displacement curves and fractography were analyzed. The results indicate that the interface strength of bi-material are decreasing with the increase of elastic modulus,the interface strength of the TS813 bonding samples is the Ergo5800 ones 4. 44,2. 17,2. 89 times,while the former of the Al/rubber is the latter's 76. 47%. The desquamating at different positions of the interface and the phenomenon of fluctuations in the LD curve are led by the uneven interface strength result from the fractography and LD curve,and the interface strength of the sample is lower,the fluctuation is more obvious between the same-material samples and same bondersamples.
Aiming at the problems of insufficient tensile strength and uneven distribution of stress,the bi-material was experimental studied and theoretical analyzed in the areas of stress strength,stress distribution,load displacement curves,etc. Utilizing the result of the bi-material of Al/PE,Al/PE,Al/PE,the TS813 bonding samples and the Ergo5800 ones were compared. Then,comparing the elastic modulus and the interface strength of PE,PP,POM,the load displacement curves and fractography were analyzed. The results indicate that the interface strength of bi-material are decreasing with the increase of elastic modulus,the interface strength of the TS813 bonding samples is the Ergo5800 ones 4. 44,2. 17,2. 89 times,while the former of the Al/rubber is the latter's 76. 47%. The desquamating at different positions of the interface and the phenomenon of fluctuations in the LD curve are led by the uneven interface strength result from the fractography and LD curve,and the interface strength of the sample is lower,the fluctuation is more obvious between the same-material samples and same bondersamples.
引文
[1]AFENDI M,MAJID M S A,DAUD R,et al.Strength prediction and reliability of brittle epoxy adhesively bonded dissimilar joint[J].International Journal of Adhesion&Adhesives,2013,45(2):21-31.
[2]Zi hui XIA,Feng JU.A new test method for the measurement of normal-shear bonding strength at bi-material interface[J].Mechanics of Advanced Materials&Structures,2012,20(7):571-579.
[3]TRUONG D V,THANH V V,HIRAKATA H,et al.Interfacial fatigue fracture criterion of bimaterial in submicron scale[J].Microelectronic Engineering,2015(140):23-28.
[4]CHUE C H,LIU C I.Disappearance of free-edge stress singularity in composite laminates[J].Composite Structures,2002,56(1):111-129.
[5]WU Z.A method for eliminating the effect of 3-D bi-material interface corner geometries on stress singularity[J].Engineering Fracture Mechanics,2006,73(7):953-962.
[6]WU Z,TIAN S,HUA Y,et al.On the interfacial strength of bonded scarf joints[J].Engineering Fracture Mechanics,2014,131(7):142-149.
[7]KRISHNAN A,XU L R.An experimental study on the crack initiation from notches connected to interfaces of bonded bi-materials[J].Engineering Fracture Mechanics,2013,111(111):65-76.
[8]WETHERHOLD R C,DARGUSH G F.Improvement of adhesive strength at a bi-material interface by adjusting the interface angles at the free edge[J].Theoretical&Applied Fracture Mechanics,2015(77):69-73.
[9]GB/T228 1-2010.金属材料拉伸试验.第1部分:室温试验方法[S].北京:中国标准出版社,2010.
[10]BERND LAUKE,TOBIAS SCHLLER,KONRAD SCHNEIDER.Determination of interface strength between two polymer materials by a new curved interface tensile test[J].Instrumentation Science&Technology,2003,10(1):1-15.
[11]BERND LAUKE.Stress concentration along curved interfaces as basis for adhesion tests[J].Composite Interfaces,2007,14(4):307-320.
[12]XU L R,SENGUPTA S.Dissimilar material joints with and without free-edge stress singularities:Part II.An integrated numerical analysis[J].Experimental Mechanics,2004,44(6):616-621.
[13]XU L R,KUAI H,SENGUPTA S.Dissimilar material joints with and without free-edge stress singularities:Part Ia biologically inspired design[J].Experimental Mechanics,2004,44(6):608-615.
[14]AKISANYA A R,MENG C S.Initiation of fracture at the interface corner of bi-material joints[J].Journal of the Mechanics&Physics of Solids,2003,51(1):27-46.
[15]AKISANYA A R,FLECK N A.Interfacial cracking from the freeedge of a long bi-material strip[J].International Journal of Solids&Structures,1997,34(13):1645-1665.
[2]Zi hui XIA,Feng JU.A new test method for the measurement of normal-shear bonding strength at bi-material interface[J].Mechanics of Advanced Materials&Structures,2012,20(7):571-579.
[3]TRUONG D V,THANH V V,HIRAKATA H,et al.Interfacial fatigue fracture criterion of bimaterial in submicron scale[J].Microelectronic Engineering,2015(140):23-28.
[4]CHUE C H,LIU C I.Disappearance of free-edge stress singularity in composite laminates[J].Composite Structures,2002,56(1):111-129.
[5]WU Z.A method for eliminating the effect of 3-D bi-material interface corner geometries on stress singularity[J].Engineering Fracture Mechanics,2006,73(7):953-962.
[6]WU Z,TIAN S,HUA Y,et al.On the interfacial strength of bonded scarf joints[J].Engineering Fracture Mechanics,2014,131(7):142-149.
[7]KRISHNAN A,XU L R.An experimental study on the crack initiation from notches connected to interfaces of bonded bi-materials[J].Engineering Fracture Mechanics,2013,111(111):65-76.
[8]WETHERHOLD R C,DARGUSH G F.Improvement of adhesive strength at a bi-material interface by adjusting the interface angles at the free edge[J].Theoretical&Applied Fracture Mechanics,2015(77):69-73.
[9]GB/T228 1-2010.金属材料拉伸试验.第1部分:室温试验方法[S].北京:中国标准出版社,2010.
[10]BERND LAUKE,TOBIAS SCHLLER,KONRAD SCHNEIDER.Determination of interface strength between two polymer materials by a new curved interface tensile test[J].Instrumentation Science&Technology,2003,10(1):1-15.
[11]BERND LAUKE.Stress concentration along curved interfaces as basis for adhesion tests[J].Composite Interfaces,2007,14(4):307-320.
[12]XU L R,SENGUPTA S.Dissimilar material joints with and without free-edge stress singularities:Part II.An integrated numerical analysis[J].Experimental Mechanics,2004,44(6):616-621.
[13]XU L R,KUAI H,SENGUPTA S.Dissimilar material joints with and without free-edge stress singularities:Part Ia biologically inspired design[J].Experimental Mechanics,2004,44(6):608-615.
[14]AKISANYA A R,MENG C S.Initiation of fracture at the interface corner of bi-material joints[J].Journal of the Mechanics&Physics of Solids,2003,51(1):27-46.
[15]AKISANYA A R,FLECK N A.Interfacial cracking from the freeedge of a long bi-material strip[J].International Journal of Solids&Structures,1997,34(13):1645-1665.