Xue Feng Yao, Yin Ji Ma, Wen Feng Hao, Yu Chao Ke, Dai Ning Fang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 51-52, 2011, DOI:10.3970/icces.2011.017.051

Abstract In this paper, some applications of residual stress measurement in engineering material and structures are introduced. First, some advanced measurement technologies are described like drill hole, residual strain gauge and digital image correlations. Second, the manufacture stresses are explained. Finally, the typical measurement results about the manufacture stress are provided, including: residual stress of integrated composite T-section structures, residual stress of adhesive joint, residual stress of bending tube, residual stress of fiber interface. These results will play an important role in designing and evaluating of advanced material and structure. More >

Xue Feng^*, Xiang Wang, Guobing Zhang, Huimin Xie, Helong Yu

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 115-116, 2011, DOI:10.3970/icces.2011.020.115

Abstract Most ceramic materials, because of their inherent brittleness, are susceptible to catastrophic failure under conditions of thermal shock. A novel method for measuring the dynamical deformation is proposed by using of high speed digital image correlation in high temperature environment. The nature texture of ceramic materials can be used as speckle while filters and monochrome produced by LED are applied to suppress black-body radiation and enhance the luminous intensity.

The light from the heated material can alter the Grayscale of material surface and the recognition for material surface will become more and more difficult with More >

Hong Miao, Chong Yang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 113-114, 2011, DOI:10.3970/icces.2011.020.113

Abstract An experimental measurement system of digital holographic interferometry is established. The sequence of holograms during the dynamic deformation of a specimen can be captured by the CCD camera continuously. These holograms are reconstructed by a 2D Fourier transform and subsequently the phase difference values between any instant and initial instant can be calculated. The original phase sequence is full of noise in both spatial and temporal domains. A windowed Fourier filtering can be employed to remove the noise and retrieve the clear phase distribution. A further windowed Fourier ridges processing makes it possible to evaluate… More >

Jiang Ming, He Xiaoyuan

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 111-112, 2011, DOI:10.3970/icces.2011.020.111

Abstract Fast-starts are brief, sudden accelerations used by fish during predator-prey encounters. In this paper, a three-dimensional (3D) test and analysis method is critical to understand the function of the pectoral fin during maneuvers. An experiment method based on Fourier Transform Profilometry for 3D pectoral fin profile variety during fish maneuvers is proposed. This method was used in a carp fast-start during prey. Projecting the moirAC fringes onto a carp pectoral fin it will produce the deformed fringe patterns contain 3D information. A high speed camera captures these time-sequence images. By Fourier transform, filter, inverse Fourier More >

Terry Yuan-Fang Chen, Jian-Siang Chen

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.2, pp. 33-34, 2011, DOI:10.3970/icces.2011.020.033

Abstract Chemical mechanical planarization (CMP) process flattens the wafer by polishing it against a rotating pad. During the polishing process, a diamond coated grinding wheel must be frequently employed to remove the accumulated debris lest the polishing surface glazes. To assure the flatness of polished wafers during the CMP process, the surface warpage of the diamond grid dresser surface must be small enough. In this study, phase-shifted shadow moirAC method was employed to measure the surface profile of diamond grinding wheel, and the warpage was determined by LSM (lease-squares surface method). Since the impinging light may… More >

Jiahui Pan, Ken Chiavone, Neil Hubble, Ryan Curry

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 105-106, 2011, DOI:10.3970/icces.2011.019.105

Abstract Recently a number of changes have occurred in electronic packaging, such as increased contact density in both packages and substrates, high reflow temperature due to Pb-free conversion, new materials, new package configurations and new fabrication processes. All these trends demand tighter mechanical tolerances and increase the challenges in modern electronic assembly. Consequently surface flatness plays a more important role in the design and manufacturing process. Warpage introduced by dissimilar CTE (Coefficient of Thermal Expansion) can cause die cracking, solder joint opens, and solder joint cracking. Characterization of the thermally-induced warpage is proving to have significant… More >

T. Yoshizawas, T. Wakayama

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 21-22, 2011, DOI:10.3970/icces.2011.019.021

Abstract This paper summarizes a principle for measurement of inner diameter or profile of pipes and tubes using optical method. Based on this principle, a compact probe has been developed for industrial applications such as car industry, heavy industry and civil engineering. In addition to a large probe for pipes, tubes and tank-like objects with diameter larger than 100 meter, such a small size probe as 3-25 mm in diameter has been produced including prototypes and commercialized ones. Some experimental results are shown that with applications. More >

Song Zhang, Yajun Wang, Laura Ekstrand, Ying Xu, Yuanzheng Gong

The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.2, pp. 39-40, 2011, DOI:10.3970/icces.2011.018.039

Abstract High-speed, high-resolution 3-D shape measurement has become increasingly important, with broad applications including medicine, homeland security, and entertainment. Techniques such as structured light, stereovision, and LIDAR have led the way in this field. In recent years, we have made some progress, developing an unprecedented 60 Hz system utilizing a digital fringe projection and phase-shifting method and simultaneously achieving 40 Hz 3-D shape acquisition, reconstruction, and display. However, a conventional digital fringe projection system requires the computer to generate sinusoidal fringe patterns to be sent to the projector. Because 8 bits are usually needed to represent… More >

Jianguo Zhu, Huimin Xie, Fulong Dai

The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.017.003

Abstract Thermal barrier coatings (TBCs) are widely used in turbines for propulsion and power generation. During build up the coatings, the continuity of the strain at the interface results in the residual stress because of the thermal expansion misfit. Since the formation of residual stresses cannot be avoided, they have to be optimized by adaptation of the process parameters during coating manufacturing. Therefore, in order to obtain information about the characterization of residual stresses for specific process conditions, the development of residual stress measurement is of vital importance.

In this paper, several techniques on residual stress More >

Ashish Das^∗, William M. Gottliebson^†,‡, Madhura Karve^∗, Rupak Banerjee^∗,§,¶

Molecular & Cellular Biomechanics, Vol.8, No.1, pp. 21-42, 2011, DOI:10.3970/mcb.2011.008.021

Abstract Right ventricular (RV) enlargement and pulmonary valve insufficiency (PI) are well-known, unavoidable long term sequelae encountered by patients who undergo tetralogy of Fallot (TOF) surgery. Despite their lifelong need for cardiac surveillance and occasional re-intervention, there is a paucity of numerical data characterizing blood flows in their pulmonary arteries (PA). Specifically, although PA regurgitation is well-known to be ubiquitously present in adult repaired TOF (rTOF) patients yet, there have been only limited numerical studies to fully characterize this process. The few studies available have utilized idealized, simplistic geometric models or overly simplistic boundary conditions that… More >