Response of a Thin Flat Scored Metallic Disc Under Pressure Impulse

Defence science journal

article

K. Gopinath¹  V. Narayanamurthy²  Y.V.D. Rao¹ 

[1] Department of Mechanical Engineering;Directorate of Systems Integration, Research Centre Imarat

关键词: Flat scored metallic disc;    Score geometry;    Score pattern;    Large deformation;    Failure;    Impulsive load;    Explicit finite element analysis;   

DOI  :  10.14429/dsj.72.17755

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

This paper presents the large deformation, and failure response of a thin flat scored metallic disc (FSMD)subjected to a pressure impulse as experienced in a break-away disc or an explosion vent. The response of this thinFSMD is numerically simulated for a loading rate and validated with an experiment, where a good agreement isfound on plastic strains, burst pressure, and deformation pattern. The loading rate and several geometric parametersof FSMD significantly influence its response. Therefore, the influence of loading rate ( P ), score depth and width-todisc thickness ratio (t1/t and b/t), diameter-to-disc thickness ratio (D/t), score length-to-disc radius ratio (l/R), scorepattern, and score geometry on the deformation and failure response of the thin FSMD is thoroughly investigated.The studies demonstrate that 1) the failure initiation point shifts from disc centre to between 1/5th and 1/3rd radius forloading rates ≤ 25 MPa/s; 2) the responses such as burst pressure, burst time, central deflection, and equivalent strainare i) sensitive to the loading rates up to 100 MPa/s, ii) sensitive to score’s depth, only up to 0.6t and insensitiveto score’s width, iii) significantly unaffected for the number of scores N > 8, iv) stabilised for l/R > 0.5 and D/t >250, v) almost the same for semi-circular, rectangular and triangular score geometries, and vi) very minimal for thenumber of scores N = 3; and 3) the failure do not initiate and propagate along all scores for N > 4 in the disc.

【 授权许可】

All Rights reserved