ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of perpendicularity error of hole on mechanical behavior of single-lap single-bolt composite joints
Received date: 2016-03-03
Revised date: 2016-04-26
Online published: 2016-05-30
Supported by
National Basic Research Program of China (2014CB046504); National Natural Science Foundation of China (51375068, 51475073)
A single-lap single-bolt experimental study of quasi-isotropic lay-ups carbon fiber/epoxy laminates is conducted to assess the effects of perpendicularity error of hole on the bearing properties of composites in aerospace. The effects of the tilt angle, tilt direction of hole and bolt torque on the bearing properties of the joints are investigated by comparing the bearing strength, chord stiffness as well as 2% offset bearing strength. It is found that when the tilt angle of hole increases from 0° to 4°, the chord stiffness of joints increases from 10% to 40%, while the bearing strength of joints decreases by 9%-12%. The bearing strength of joints is not influenced by the tilt direction of hole. However, the chord stiffness changes about 20%-30% as the tilt direction of hole changes. Higher bolt torque can effectively improve the bearing strength of joints, but has little effect on chord stiffness. With the increase of the tilt angle of hole, the effect of the bolt torque on 2% offset bearing strength decreases.
Key words： composites; single-lap joint; bearing strength; perpendicularity error; bolt torque
GAO Hang , WANG Jian , YANG Yuxing , LIU Xueshu , CHEN Lei , LI Rupeng . Effect of perpendicularity error of hole on mechanical behavior of single-lap single-bolt composite joints[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(2) : 420183 -420191 . DOI: 10.7527/S1000-6893.2016.0133
[1] MCCARTHY M A, MCCARTHY C T, LAWLOR V P, et al. Three-dimensional finite element analysis of single-bolt, single-lap composite bolted joints:Part I-Model development and validation[J]. Composite Structures, 2005, 71(2):140-158.
[2] IREMAN T. Three-dimensional stress analysis of bolted single-lap composite joints[J]. Composite Structures, 1998, 43(3):195-216.
[3] THOPPUL S D, FINEGAN J, GIBSON R F. Mechanics of mechanically fastened joints in polymer-matrix composite structures-a review[J]. Composites Science and Technology, 2009, 69(3):301-329.
[4] KRETSIS G, MATTHEWS F L. The strength of bolted joints in glass fibre/epoxy laminates[J]. Composites, 1985, 16(2):92-102.
[5] COOPER C, TURVEY G J. Effects of joint geometry and bolt torque on the structural performance of single bolt tension joints in pultruded GRP sheet material[J]. Composite Structures, 1995, 32(1):217-226.
[6] KIRAL B G. Effect of the clearance and interference-fit on failure of the pin-loaded composites[J]. Materials & Design, 2010, 31(1):85-93.
[7] KELLY G, HALLSTRÖM S. Bearing strength of carbon fibre/epoxy laminates:Effects of bolt-hole clearance[J]. Composites Part B:Engineering, 2004, 35(4):331-343.
[8] MCCARTHY M A, LAWLOR V P, STANLEY W F, et al. Bolt-hole clearance effects and strength criteria in single-bolt, single-lap, composite bolted joints[J]. Composites Science and Technology, 2002, 62(10):1415-1431.
[9] MCCARTHY M A, LAWLOR V P, STANLEY W F. An experimental study of bolt-hole clearance effects in single-lap, multibolt composite joints[J]. Journal of Composite Materials, 2005, 39(9):799-825.
[10] MCCARTHY M A, MCCARTHY C T, STANLEY W F. Bolt-hole clearance effects in composite joints[M]. Composite Joints and Connections:Principles, Modelling and Testing, 2011:112.
[11] WANG H S, HUNG C L, CHANG F K. Bearing failure of bolted composite joints. Part I:Experimental characterization[J]. Journal of Composite Materials, 1996, 30(12):1284-1313.
[12] KHASHABA U A, SALLAM H E M, AL-SHORBAGY A E, et al. Effect of washer size and tightening torque on the performance of bolted joints in composite structures[J]. Composite Structures, 2006, 73(3):310-317.
[13] 张岐良, 曹增强. 复合材料螺接性能的影响因素研究[J]. 航空学报, 2012, 33(4):755-762. ZHANG Q L, CAO Z Q. Study on factors influencing the performance of composite bolted connections[J]. Acta Aeronautica et Astronautica Sinica, 2012, 33(4):755-762(in Chinese).
[14] 裴旭明, 陈五一, 张东初, 等. 制孔工艺对紧固孔加工精度的影响[J]. 机械科学与技术, 2011, 30(4):613-617. PEI X M, CHEN W Y, ZHANG D C, et al. Influence of drilling processes on the machining accuracy of fastener holes[J]. Mechanical Science and Technology for Aerospace Engineering, 2011, 30(4):613-617(in Chinese).
[15] ZHANG J, LIU F, ZHAO L, et al. A progressive damage analysis based characteristic length method for multi-bolt composite joints[J]. Composite Structures, 2014, 108:915-923.
[16] LI X, GAO W, LIU W. Post-buckling progressive damage of CFRP laminates with a large-sized elliptical cutout subjected to shear loading[J]. Composite Structures, 2015, 128:313-321.
[17] ASTM. Standard test method for bearing response of polymer matrix composite laminates:ASTM D5961/D5961M-13[S]. Philadelphia:American Society for Testing and Materials, 2013.
[18] CHISHTI M, WANG C H, THOMSON R S, et al. Experimental investigation of damage progression and strength of countersunk composite joints[J]. Composite Structures, 2012, 94(3):865-873.
[19] ZHAI Y, LI D, LI X, et al. An experimental study on the effect of bolt-hole clearance and bolt torque on single-lap, countersunk composite joints[J]. Composite Structures, 2015, 127:411-419.
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