Study of high-strength CFRP bolted joints with failure- monitoring cone washers

doi:10.1007/s11465-011-0231-1

Front Mech Eng

2011, Vol. 6

Issue (3) : 272-276 https://doi.org/10.1007/s11465-011-0231-1

RESEARCH ARTICLE

Study of high-strength CFRP bolted joints with failure- monitoring cone washers

Tsukasa KATSUMATA¹(

), Yoshihiro MIZUTANI², Akira TODOROKI², Ryosuke MATSUZAKI²

1. Department of Mechanical Engineering, Graduated School of Tokyo Institute of Technology, Tokyo 152-8550, Japan; 2. Department of Mechanical Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan

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Abstract

To increase the strength of carbon-fiber-reinforced plastic (CFRP) bolted joints, a method to increase the friction force between carbon-fiber-reinforced plastic members was proposed. The increase in failure load for the proposed joint was confirmed in finite-element method analyses and joint tests. Additionally, the feasibility of damage monitoring using surface strains of the cone washer was demonstrated.

Keywords composite bolted joint failure monitoring finite-element method

Corresponding Author(s): KATSUMATA Tsukasa,Email:tkatsuma@mes.titech.ac.jp

Issue Date: 05 September 2011

Cite this article:

Tsukasa KATSUMATA,Yoshihiro MIZUTANI,Akira TODOROKI, et al. Study of high-strength CFRP bolted joints with failure- monitoring cone washers[J]. Front Mech Eng, 2011, 6(3): 272-276.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-011-0231-1
https://academic.hep.com.cn/fme/EN/Y2011/V6/I3/272

Fig.1 Geometrical configuration of the proposed cone washer (unit: mm)

Fig.2 Geometrical configuration of the specimen based on ASTM D5961 (unit: mm)

Fig.3 Specimens of the joint tests. (a) Conventional joint; (b) proposed joint

Tab.1 Failure loads determined in the joint tests

Fig.4 Photographs of damage to the CFRP contact surface. (a) Conventional joint; (b) proposed joint

Tab.2 Material properties of HTA/6376 []

Tab.3 Strength of CFRP

Tab.4 Failure loads determined from the FEM analyses

Fig.5 Failure prediction for the CFRP in the progressive failure stage. (a) Conventional joint; (b) proposed joint

Fig.6 Locations of strain-monitoring points on the cone washer surface

Fig.7 Directions of washer surface strains

Fig.8 Relationships between washer strain and joint load for the circumferential direction. (a) On the grip-side washer with progressive failure; (b) on the edge-side washer with bearing failure

Fig.9 Locations of the elements in forced bearing failure around the edge-side bolt hole

1	Niu M C Y. Composite Airframe Structures. Hong Kong: Conmilit Press Ltd., 1992
2	Katsumata T, Mizutani Y, Todoroki A, Matsuzaki R. A fundamental study on static strength improvement of CFRP bolted joints by increasing friction force. Journal of Solid Mechanics and Materials Engineering , 2010, 4(6): 711–719 doi: 10.1299/jmmp.4.711
3	MIL-HDBK-17-1F. Composite Materials Handbook Volume 1. Polymer Matrix Composites Guidelines for Characterization of Structural Materials, Department of Defense, 2002
4	Tserpes K I, Papanikos P, Kermanidis T. Three-dimensional progressive damage model for bolted joints in composite laminates subjected to tensile loading. Fatigue & Fracture of Engineering Materials & Structures , 2001, 24: 663–675 doi: 10.1046/j.1460-2695.2001.00424.x

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