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Research Papers

An Instability Discriminant Model of a Composite Metal Plate Under a Nonlinear Load

[+] Author and Article Information
Dongcheng Wang

National Engineering Research Center for
Equipment and Technology of Cold Rolling Strip,
State Key Laboratory of Metastable Materials Science and Technology,
School of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, Hebei, China
e-mail: wdc731@126.com

Wei Zhang

National Engineering Research Center for
Equipment and Technology of Cold Rolling Strip,
School of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, Hebei, China
e-mail: zw_smilesunshine@163.com

Zhijie Wang

National Engineering Research Center for
Equipment and Technology of Cold Rolling Strip,
School of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, Hebei, China
e-mail: 1214052028@qq.com

Manuscript received July 2, 2016; final manuscript received October 31, 2016; published online January 11, 2017. Assoc. Editor: Gracious Ngaile.

J. Manuf. Sci. Eng 139(6), 061002 (Jan 11, 2017) (8 pages) Paper No: MANU-16-1362; doi: 10.1115/1.4035185 History: Received July 02, 2016; Revised October 31, 2016

Composite plates have the advantages of high strength and light weight and are widely used in the field of aerospace engineering. Instability is their most common failure mode. Considerable research on the instability of composite plates under linear loads has been conducted, but there is less research on the instability of composite plates under nonlinear loads. Therefore, an instability discriminant model for a metal composite plate under a nonlinear load is established using a metal composite plate as the object of study. The influence of width, thickness, thickness ratio, and material properties on the discrimination factor of instability is analyzed. Analysis results show that, for common metal composite plates with aspect ratios four, under the same load, larger ratios of width to thickness, smaller elastic moduli, and larger Poisson's ratios of each layer of the plate make the plate more prone to instability. Under the premise of the same total load, compared with the linear uniform load, the composite plate is more and more prone to instability with the increase of the nonlinear load. These conclusions serve to supplement theoretical results.

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References

Figures

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Fig. 1

Schematic diagram of a metal composite plate

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Fig. 2

Schematic diagram of a three-layer metal composite plate

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Fig. 4

Three different composite plates

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Fig. 5

Nonlinear compression scheme

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Fig. 7

Pressure test setup

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Fig. 8

Discrimination factor versus plate width

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Fig. 9

Discrimination factor versus plate thickness

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Fig. 10

Discrimination factor versus thickness of cast iron

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Fig. 11

Discrimination factor versus elastic modulus of the two sides of the metal

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Fig. 12

Discrimination factor versus the elastic modulus of the middle layer metal

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Fig. 13

Discrimination factor versus the Poisson's ratio of the outer layer

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Fig. 14

Discrimination factor versus the Poisson's ratio of the middle layer

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