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The Experimental Study of Compression and Instability of Thin Walled Spherical Shells

Author: HaoWeiWei
Tutor: DongXinLong
School: Ningbo University
Course: Engineering Mechanics
Keywords: Thin-walled shell Static state Dynamic Impact Finite Element
CLC: TH49
Type: Master's thesis
Year: 2011
Downloads: 52
Quote: 0
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Abstract


Thin-walled shell as a basic structural elements are widely used in various vehicles and pressure vessels, such as spacecraft and deepwater engineering pressure vessel, and therefore great significance to study the buckling of thin-walled shell. Thin spherical shell of research work in the local impact loads will have important theoretical and practical values. With all the attention on the structural safety, the study of the mechanical properties of thin-walled spherical shell is also increasing. In this paper, thin-walled stainless steel shell of the static and dynamic compression experiments. The experimental data obtained were analyzed through the thin-walled spherical shell static compression results showed that: a ratio of diameter to thickness of the thin-walled spherical shell in compression flip instability when the ratio ΔC / T and thin-walled sphere radius R and the thickness t of the critical displacement ΔC and thin-walled spherical shell of thickness t Related ratio R / t, as the diameter to thickness of the thin-walled spherical shell feature size of the increase of the ratio R / t the the critical flip displacement ΔC / t increases. The thin-walled shell deformation force response curve decreases with increasing radius to thickness ratio R / t. Calculated and experimental curves for both comparisons: comparative analysis of calculated and experimental curves drawn the elastic calculation in line with the model in the initial stage of compression with the experimental curve better; rigid-plastic calculation curve flatten the sphere stage compared with the experimental curve differences, with the compression displacement increases, the rigid-plastic computing and experimental curves fit better. The dynamic compression experimental Hopkinson pole dynamic data, including the dynamic displacement - time curve and force - time curve of the two curves were described in detail, the force - displacement curves under different impact velocities , a comparative analysis of the curves obtained with the static curve, the analysis shows that: in the initial stage of compression, dynamic compression force is less than the static compressive force. The thin-walled spherical shell of the same diameter to thickness ratio R / t smaller the radius, the thickness of the compression of the dynamic impact, the smaller the required compression force. Thin-walled spherical shell under shock compression is easier to form an asymmetric buckling, an increasing trend in the number of sides of a polygon formed with the increase of the impact speed, thin-walled spherical shell instability. Finite element calculation of dynamic experiments, by finite element method in the case of finite element calculation results with the experimental results agree well: thin-walled shell with increasing impact velocity Asymmetric Buckling compression displacement and compression The force is continuously increased.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Gas compression and transportation machinery > Pressure vessel
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