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1. Effects of stitches on the mechanical response of stitched composite single-lap joints | |||
WANG Zhiyong | |||
Mechanics 27 November 2015 | |||
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Abstract:The functions of stitch thread in stitched composite single-lap joints are investigated by experimental measurement and finite element (FE) simulation. Through microscopic observations, it is found that stitches severely destroyed the microstructures of laminated composites, which should have impact on the mechanical behaviors of the composite around the stitches. Digital image correlation (DIC) technique is used to measure the strain fields near the stitches when the specimens are under tensile loading. The experimental results reveal the degeneration of the mechanical properties of the composite near the stitch threads. In FE analysis, the virtual crack closure technique (VCCT) is used to analyze the effect of the stitches on the strain energy release rate (SERR) for a delamination progressing along the interface between the adherends. The FE results indicate that stitches can effectively restrain the extension of the delamination between the two adherends. | |||
TO cite this article:WANG Zhiyong. Effects of stitches on the mechanical response of stitched composite single-lap joints[OL].[27 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4666158 |
2. An evaluation of convergence criteria on digital image correlation | |||
Pan Bing | |||
Mechanics 15 December 2013 | |||
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Abstract:A fast, robust and accurate digital image correlation (DIC) method, which uses an efficient inverse compositional matching Gauss-Newton (IC-GN) algorithm, was recently proposed for full-field deformation measurement. As an iterative local optimization algorithm, IC-GN algorithm iteratively solves for the incremental warp assumed on the reference subset until the preset convergence criteria are satisfied. In the literature, different convergence criteria have been set for iterative optimization algorithms. However, on the one hand, stringent convergence criteria lead to increased number of iterations and lessen the computational efficiency. On the other hand, too loose convergence conditions enhance the computational efficiency but may decrease the registration accuracy. Understanding the impact of prescribed convergence criteria on DIC measurement and how to choose proper convergence criteria are therefore fundamental problems in realizing high-efficiency yet high-accuracy DIC analysis. In this paper, the convergence characteristics of IC-GN algorithm are investigated using real experimental images. The effect of various convergence criteria on the efficiency and accuracy of IC-GN algorithm are carefully examined. Recommendations are given to select proper convergence criteria for more efficient implement of IC-GN algorithm. | |||
TO cite this article:Pan Bing. An evaluation of convergence criteria on digital image correlation[OL].[15 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4575332 |
3. Crack tip deformation measurement using single-element extended digital image correlation | |||
Chen Jinlong,Zhang Xiaochuan,Zhan Nan | |||
Mechanics 18 December 2012 | |||
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Abstract:Since the crack tip displacement field influences the crack paths under both fatigue and fracture conditions strongly, it is very important to develop a test method with high accuracy to measure this deformation parameter. Single-element extended digital image correlation (X-DIC) using the enrichment function to describe the crack tip singularity, which could measure the discontinuous deformation directly. Simulated images are used to verify the performance of single-element X-DIC, the measured crack tip displacement field is in accordance with the given value. Displacement fields of the compact tension specimen under pure mode I loading condition was measured. The influence to the measurement accuracy caused by the crack width,subset size and subset location was discussed. All results in this paper show that single-element X-DIC could be used to measure the crack tip displacement field with high accuracy. | |||
TO cite this article:Chen Jinlong,Zhang Xiaochuan,Zhan Nan. Crack tip deformation measurement using single-element extended digital image correlation[OL].[18 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4505660 |
4. Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings | |||
Yao Wangbin,Dai Cuiying,Mao Weiguo,Lu Chunsheng,Zhou Yichun | |||
Mechanics 04 December 2011 | |||
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Abstract:An acoustic emission technique was used to monitor the cracking behavior and fracture process of thermal barrier coatings subjected to tensile loading. Acoustic emission signals were extracted and preformed by fast Fourier transform, and their corresponding characteristic frequency spectrums and dominant bands were obtained to reveal fracture modes. Three different characteristic frequency bands were confirmed, corresponding to substrate deformation, surface vertical crack and interface delamination, with the aid of scanning electronic microscopy observations. A map of the tensile failure mechanism of air plasma-sprayed thermal barrier coatings was established. Using experimental data, the fracture strength and interface shear strength were estimated as 45.73 ± 3.92 MPa and 20.51 ± 1.74 MPa, respectively, which are well agreement with available results.. | |||
TO cite this article:Yao Wangbin,Dai Cuiying,Mao Weiguo, et al. Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings[OL].[ 4 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4453646 |
5. Non-destructive in-situ measurements on interface failure of brittle coating/ductile substrate systems by digital image correlation and acoustic emission techniques | |||
Mao Weiguo,D. J. Wu,C. Lu | |||
Mechanics 17 June 2011 | |||
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Abstract:In this paper, we proposed a non-destructive measurement method combined with digital image correlation and acoustic emission techniques to in-situ monitor the interface failure and internal damage of brittle coating/ductile substrate systems under different size scales. We established a good correspondence relationship between digital image correlation and acoustic emission results to judge coating failure. The method was utilized to successfully determine the fracture toughness of thermal barrier coating systems during bending tests. | |||
TO cite this article:Mao Weiguo,D. J. Wu,C. Lu. Non-destructive in-situ measurements on interface failure of brittle coating/ductile substrate systems by digital image correlation and acoustic emission techniques[OL].[17 June 2011] http://en.paper.edu.cn/en_releasepaper/content/4432729 |
6. Optimization of Speckle Size in Digital Image Correlation Method | |||
Wang Zhiyong,Li Li’an,Wang Shibin | |||
Mechanics 05 February 2010 | |||
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Abstract:Digital image correlation (DIC) is a mature image processing method widely used in displacement field measurements. For a better measurement precision, speckle patterns are usually created on specimen surfaces. The shape and size of speckle have been generally known to significantly affect displacement measurement precision of DIC. In the presented paper, a theoretical model is built to predict the effect of speckle size on the displacement measurement precision of DIC when the intensity pattern noise and the interpolation error are considered. The optimal speckle size is obtained to minimize the displacement measurement error based on the theoretical model. Additionally, numerical experiments are also executed to obtain the optimal speckle size. The results from the theoretical model are in a good agreement with the results from the numerical experiments. | |||
TO cite this article:Wang Zhiyong,Li Li’an,Wang Shibin. Optimization of Speckle Size in Digital Image Correlation Method[OL].[ 5 February 2010] http://en.paper.edu.cn/en_releasepaper/content/39956 |
7. Debond propagation in sandwich structure under uniaxial in-plane compression | |||
Chen Jinlong,Gong Wenran,Qin Yuwen | |||
Mechanics 16 January 2009 | |||
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Abstract:Sandwich structures are made of thin and stiff face sheets and weaker core. The upper and lower face sheets are bonded to the core by glue. In practice, there are always face/core debonds exists in sandwich structure, these debonds are usually induced during manufacturing or by hard object impact during service. The purpose of this paper is to predict the mechanical behavior and the propagation of the debond of a compression loaded panel containing a face/core debond. During the research, we used the FEA software to simulate the mechanical behavior and the propagation of the debond of the compression loaded panel. This research concentrates on the simulation of panel with circular debond, we simulate the glue with three sets of spring elements. Compared with the experimental results and those computed by energy release rate, we proved the reasonability of the results. We also discussed the choosing of debond propagation criterion and found that the criterion we used in this paper operates easily and has higher precision. | |||
TO cite this article:Chen Jinlong,Gong Wenran,Qin Yuwen. Debond propagation in sandwich structure under uniaxial in-plane compression[OL].[16 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27997 |
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