Fundamental Investigation on the Bearing Strength of a CF/Epoxy Pinned Joint under Various Temperatures

Hirano, Noriyoshi; Takao, Yoshihiro; Matsubara, Terutake; Wang, Wenxue

doi:10.6089/jscm.30.102

Cited by 3 publications

(14 citation statements)

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“…Three out of five specimens that were loaded to obtain P UCS [17] were used for the damage observation. In these cases, the crosshead was stopped just after detecting the load drop, i.e., where the load decreased drastically, as in other previous studies [15] without using the aforementioned control.…”

Section: Test Proceduresmentioning

confidence: 99%

Effects of Temperature on the Bearing Strength of CF/Epoxy Pinned Joints

Hirano

Takao

Wang

2006

Journal of Composite Materials

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Pinned joint bearing tests are conducted at room temperature (25 C) and at high (150 C) and low (À100 C) temperatures for CF/epoxy quasi-isotropic laminates cured at 180 C with two stacking sequences, namely, [0/45/À45/90] 3S and [90/À45/45/0] 3S . Then, the evolution of microscopic damage as a function of load is examined by using an optical microscope. This article presents an original set of experimental data on the bearing strength of CF/epoxy pinned joints at high and low temperatures, as well as room temperature, while the previous studies did not cover the wide range of temperatures. Moreover, a technique for dynamically monitoring the load is developed to obtain the damage at the maximum load. The critical damage has not been distinguished from the secondary ones in the previous literature. It is found that the bearing failure of a pinned joint is composed of various damages depending on environmental temperatures; further, the strength of the pinned joint is closely related to the compressive kinking failure of all the inner 0 layers. Other characteristic features of the damage evolution at each temperature are discussed in detail.

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Section: Test Proceduresmentioning

confidence: 99%

Effects of Temperature on the Bearing Strength of CF/Epoxy Pinned Joints

Hirano

Takao

Wang

2006

Journal of Composite Materials

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“…11 Hirano et al conducted pin-bearing tests of quasi-isotropic laminates and obtained a smooth change of bearing strength as a function of environmental temperature with error bars. 22 and 33% less knee point strength at LT-100 and ET150, respectively, compared to the RT case as shown in Fig. 9.4 , where P US is shown as a piecewise linear curve together with P max .…”

Section: Bearing Strength Of a Jointmentioning

confidence: 93%

“…After one hour at the testing temperature, when the temperatures of all the thermocouples remain steady within 2°C of the desired testing temperature, mechanical loading starts. 9.2.2 Load-displacement response [22][23][24]28 The typical load-displacement curves of a pin joint obtained at LT, RT and ET are shown in Fig. 9.2 , where a semi-circular-hole specimen was loaded.…”

Section: Methodsmentioning

confidence: 99%

“…Sometimes a semi-circular-hole specimen [22][23][24]27,28 is also adopted. The test method is schematically shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, most of the studies related to temperature effects are expected to use the specimen geometry with enough specimen width to hole diameter ratio ( w/d ) and enough edge distance to hole diameter ratio ( e/d ). Though there are various literature items on mechanical Hirano et al 22 performed the bearing test of a semi-circular notched pin joint of T800/3631; they obtained the effects of various temperatures on the strength and load-displacement curve and investigated the microscopic features of damage and their three-dimensional (3D) distribution. Further, Hirano et al 23 investigated the microscopic damage evolution under LT, RT and ET at various load levels and verifi ed that the critical damage is always the compressive kinking of 0° inner layers by using a technique of dynamic monitoring of load.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of temperature on the response of composite bolted joints

Takao

2011

Composite Joints and Connections

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OS14-1-4 Load control to preserve the critical damage of bearing mode failure from additional damage evolution of a pin joint in quasi-isotropic CFRP laminates under tensile loading

Takao

Hirano

Seike

et al. 2007

ATEM

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A pin joint of composite laminates has three failure modes: tensile, shear out and bearing and it is designed to yield the bearing failure mode since the endurance limit is high and the load-displacement curve has rather tough characteristics compared to other two modes. However, it is difficult to obtain the damage of the pin at the maximum load. Conventional manual control could not eliminate the time lag between detection of the maximum load and action to the machine by the operator. Thus, the additional damage evolution due to the stored elastic energy appears in the failed joint even if the bearing mode is rather tough and there are several hundred milliseconds between times at the maximum load and catastrophic failure. This paper shows that the damage at the maximum load is preserved by using the control code TestStar TM applied to MTS hydraulic loading machines. Previous papers on pin joints could not present the damage at the maximum point and missed the critical damage to trigger the bearing failure of a pin joint. This control method could separate clearly the critical damage and additional ones and contribute to the understanding of the failure mechanism of a CFRP pin joint.

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Fundamental Investigation on the Bearing Strength of a CF/Epoxy Pinned Joint under Various Temperatures

Cited by 3 publications

References 0 publications

Effects of Temperature on the Bearing Strength of CF/Epoxy Pinned Joints

Effects of Temperature on the Bearing Strength of CF/Epoxy Pinned Joints

Effects of temperature on the response of composite bolted joints

OS14-1-4 Load control to preserve the critical damage of bearing mode failure from additional damage evolution of a pin joint in quasi-isotropic CFRP laminates under tensile loading

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