【摘要】：建立了非接觸光學(xué)測(cè)量實(shí)驗(yàn)系統(tǒng),對(duì)薄壁球殼受剛性平面壓縮的連續(xù)變形及失穩(wěn)行為進(jìn)行了實(shí)驗(yàn)研究。實(shí)驗(yàn)以理想彈塑性材料制成的薄且壁厚均勻的乒乓球?yàn)閴嚎s對(duì)象,采用透明石英玻璃板作為剛性平面,用相機(jī)透過(guò)玻璃板采集清晰的散斑圖像。然后利用具有非接觸、全場(chǎng)、高精度等優(yōu)點(diǎn)的三維數(shù)字圖像相關(guān)(3D-DIC)技術(shù)對(duì)與剛性平面接觸的乒乓球表面的連續(xù)變形進(jìn)行直接測(cè)量,同時(shí)利用二維數(shù)字圖像相關(guān)技術(shù)結(jié)合壓力傳感器得到對(duì)應(yīng)的力-位移關(guān)系。實(shí)驗(yàn)研究表明,基于3D-DIC方法測(cè)量三維表面變形場(chǎng),實(shí)現(xiàn)了對(duì)受剛性平面壓縮的乒乓球表面從局部壓平階段到軸對(duì)稱屈曲階段,進(jìn)而演化到非軸對(duì)稱屈曲階段等力學(xué)行為的可視化。實(shí)驗(yàn)結(jié)果表明,對(duì)乒乓球半徑的測(cè)量精度可達(dá)0.5%,利用Abaqus有限元方法得到的結(jié)果與實(shí)驗(yàn)結(jié)果非常吻合,驗(yàn)證了所提方法的有效性。
[Abstract]:A non-contact optical measurement system is established to study the continuous deformation and instability behavior of thin-walled spherical shells subjected to rigid plane compression. In the experiment, the thin and uniform wall thickness table tennis made of ideal elasto-plastic material is used as the compression object, the transparent quartz glass plate is used as the rigid plane, and the clear speckle image is collected by the camera through the glass plate. Then the three-dimensional digital image correlation (3D-DIC) technology, which has the advantages of non-contact, full-field and high-precision, is used to measure the continuous deformation of the table tennis surface in contact with the rigid plane directly. At the same time, two-dimensional digital image correlation technology combined with pressure sensor is used to get the corresponding force-displacement relationship. The experimental results show that the three-dimensional surface deformation field is measured based on the 3D-DIC method, and the table tennis surface compressed by rigid plane is achieved from the stage of local flattening to the stage of axisymmetric buckling. Then, the visualization of mechanical behavior, such as non-axisymmetric buckling stage, is obtained. The experimental results show that the measurement accuracy of ping-pong radius can reach 0.5%. The results obtained by using the Abaqus finite element method are in good agreement with the experimental results, and the effectiveness of the proposed method is verified.
【作者單位】： 東南大學(xué)江蘇省工程力學(xué)分析重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(No.11532005;No.11472081;No.11272090) 江蘇省博士后科研資助計(jì)劃項(xiàng)目(No.1501016C) 江蘇省工程力學(xué)分析重點(diǎn)實(shí)驗(yàn)室開放課題基金資助項(xiàng)目(No.LEM16B04)
【分類號(hào)】：O348.1

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