中心裂纹菱形板的自由振动分析

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2017-12-01 DOI:10.20855/IJAV.2017.22.4494

M. S. Azam, V. Ranjan, B. Kumar

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引用次数: 4

摘要

本文采用有限元方法对存在中心裂纹的菱形板进行了自由振动分析。Mindlin板理论已被应用于研究过程中。已经考虑了板边缘的以下六个边界条件。它们在所有边缘处被简单支撑（SSSS）、在所有边缘被夹紧（CCCC）、在全部边缘处自由（FFFF）、被简单支撑夹紧（CSSC）、被自由夹紧（CFFC）和被简单支撑自由夹紧（CSFS）。裂纹长度对不同斜交角（15）菱形板固有频率的影响◦, 30◦, 45◦, 60◦ 已经进行了研究。在给定的裂纹率（无量纲裂纹长度）下，对于CCCC、SSSS和CSSC边缘条件，由于菱形板中存在中心裂纹而导致的基频下降百分比随着斜角的增加而增加。在CFFC、CSFS和FFFF边缘条件下，不同斜交角下裂纹率为0.2时，菱形板固有频率的百分比下降非常小。在菱形板的CFFC边缘条件下，在所有斜角和考虑所有裂纹率的情况下，基频的百分比下降在0.7%以内。通过本方法获得的一些结果已经与已发表的结果进行了比较。对于菱形裂纹板，得到的大多数结果都是新颖的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Free Vibration Analysis of Rhombic Plate with Central Crack

In this paper, free vibration analysis of rhombic plate with pre-existing central crack has been done using the finite element method. The Mindlin theory of plate has been used in the process of investigation. The following six boundary conditions at the edges of the plate have been considered. They are simply supported at all edges (SSSS), clamped at all edges (CCCC), free at all edges (FFFF), clamped-simply supported (CSSC), clamped-free (CFFC), and clamped-free-simply supported (CSFS). Effects of crack length on natural frequencies of rhombic plate with different skew angles i.e. 15◦, 30◦, 45◦, 60◦ have been studied. It is observed that percentage drop in fundamental frequency due to presence of central crack in the rhombic plate increases with an increase in skew angle for CCCC, SSSS, and CSSC edge conditions at a given crack ratio (non-dimensional crack length). Under the CFFC, CSFS, and FFFF edge conditions, percentage drop in natural frequency of rhombic plate is very small for crack ratio of 0.2 at different skew angles. In case of the CFFC edge condition of the rhombic plate, percentage drop in fundamental frequency is within 0.7% at all skew angles and with all crack ratios considered. Some of the results obtained by the present method have been compared with the published results. Most of the results obtained are novel for rhombic crack plate.

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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