Experimental Mechanics

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Residual Stresses in Cu/Ni Multilayer Thin Films Measured Using the Sin2ψ Method
Experimental Mechanics - Tập 59 - Trang 111-120 - 2018
I. G. McDonald, W. M. Moehlenkamp, D. Arola, J. Wang
Residual stresses in multilayer thin films are of substantial importance to the service life of advanced engineering systems. In this investigation, the residual stresses in magnetron sputtered Cu/Ni multilayer thin films were characterized using x-ray diffraction (XRD) and the sin2ψ method. The influence of layer thickness on residual stress was explored for films with alternating Ni and Cu layer...... hiện toàn bộ
The moiré method for measuring large-plane nonhomogeneous deformations
Experimental Mechanics - Tập 10 - Trang 521-528 - 1970
L. P. Martin, F. D. Ju
Moiré-fringe equations have been developed for directly determining the components of Green's and Cauchy's deformation tensors from measurements of fringe pitch and angle. The equations, which were previously verified for large-plane homogeneous deformations, are used to determine the deformation-tensor components for nonhomogeneous strain fields. The results are compared to theoretical values. Sp...... hiện toàn bộ
A Ring-Projection-Based Two-Scale Approach for Accurate Digital Image Correlation of Large Translations and Rotations
Experimental Mechanics -
Pengtao Xie, Zhichao Lu, Gang Lin, Wenbin Li, Li Wang
Experimental study of large-diameter thin-wall pressure vessels
Experimental Mechanics - Tập 1 - Trang 33-42 - 1961
A. J. Durelli, J. W. Dally, S. Morse
An experimental stress analysis of three cylindrical pressure vessels with radius/thickness ratios ranging from 100 to 238 and different head closures is described. Brittle coatings and electrical strain gages were employed to determine stress distributions over the entire outer surface of the vessels. Electrical strain gages alone were used to determine stresses on the inside surface of the vesse...... hiện toàn bộ
Acoustic-velocity measurement across the diameter of a liquid-metal column
Experimental Mechanics - Tập 19 - Trang 171-174 - 1979
C. A. Calder, W. W. Wilcox
Present techniques for measuring sound velocity in liquid metals have been limited by the use of transducers which cannot survive in extreme-temperature conditions. These methods also require relatively long measurement times. An optical noncontacting method has been developed which may be used for extremely short experimental times and very high temperatures and pressures. This technique is being...... hiện toàn bộ
Characterization of a Laser Extensometer for Split Hopkinson Pressure bar Experiments
Experimental Mechanics - Tập 57 - Trang 1265-1273 - 2017
B. S. Joyce, M. Dennis, J. Dodson, J. Wolfson
This paper examines a laser extensometer to calculate the strain in a sample during split Hopkinson pressure bar (SHPB) experiments. This method offers a non-contact, direct method for measuring sample strain which does not rely on one-dimensional wave propagation assumptions. First a single bar experiment is used to compare the extensometer’s accuracy and frequency response against a laser vibrom...... hiện toàn bộ
A New Apparatus for Testing Shear-Slip Properties of Rock Joint Subjected to Dynamic Disturbance
Experimental Mechanics - - 2024
W. Yuan, J.C. Li, C.J. Zou, J. Zhao
To evaluate the stability of jointed rock masses subjected to dynamic disturbance, laboratory dynamic shear test on rock joint is necessary. Developing dynamic shear test equipment for rock joint is currently a pressing issue. To address this issue, a new apparatus is developed to reproduce the shear-slip process of rock joint subjected to dynamic disturbance under various initial stress state. Th...... hiện toàn bộ
Methodology for the Stress Measurement of Ferromagnetic Materials by Using Magneto Acoustic Emission
Experimental Mechanics - Tập 54 - Trang 1431-1439 - 2014
Fei Su
Magneto acoustic emission (MAE) is a magnetic nondestructive testing (NDT) method that has been used in different fields for 30 years. MAE is a promising method for the early characterization of damage and the evaluation of the residual stress of ferromagnetic materials. However, this technique is still in its early stage and requires further development. The mechanism and influence factors of MAE...... hiện toàn bộ
An experimental weight function for stress-intensity-factor calibrations
Experimental Mechanics - Tập 21 - Trang 371-378 - 1981
D. Bar-Tikva, A. F. Grandt, A. N. Palazotto
This paper describes a set of experiments conducted to demonstrate application of weight-function methods to experimental stress-intensity-factor calibrations. The weight-function method allows stress-intensity-factor and crack-surface-displacement information obtained for one loading to be generalized in a form which allows direct computation of stress-intensity factors for other load configurati...... hiện toàn bộ
Identification of Contact Stress on Non-conforming Contact Interface Based on Local Displacement Measurement
Experimental Mechanics - Tập 58 - Trang 417-426 - 2017
C. Sun, Y. Zhou, J. Chen, H. Miao
The experimental identification of contact stress is important in many areas. In this paper, we present an inverse method for identifying the stress distribution on non-conforming contact interface based on local displacement measurements. A mechanical model is established to formulate the relationship between the contact stress and the displacement field near the interface. An optical method, nam...... hiện toàn bộ
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