A method of the direct measurement of the true stress–strain curve over a large strain range using multi-camera digital image correlation

Li, Junrui; Yang, Guobiao; Siebert, Thorsten; Shi, Ming; Yang, Lianxiang

doi:10.1016/j.optlaseng.2018.03.029

Cited by 77 publications

(25 citation statements)

References 16 publications

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“…In the former method, a pair of strain gauges (SKF-27085, 200 μm gauge length; Kyowa) was immobilized to the proximal tibia in an orthogonal direction, and the tibia was compressed with 1 N, 2 N, or 5 N loads at 2 Hz. In the latter method, we employed the previously described procedure, 46 and the strain was calculated from the dynamic pattern of displacements on the tibial surface.…”

Section: Strain Measurementmentioning

confidence: 99%

Skeletal loading regulates breast cancer-associated osteolysis in a loading intensity-dependent fashion

et al. 2020

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Osteocytes are mechanosensitive bone cells, but little is known about their effects on tumor cells in response to mechanical stimulation. We treated breast cancer cells with osteocyte-derived conditioned medium (CM) and fluid flow-treated conditioned medium (FFCM) with 0.25 Pa and 1 Pa shear stress. Notably, CM and FFCM at 0.25 Pa induced the mesenchymal-to-epithelial transition (MET), but FFCM at 1 Pa induced the epithelial-to-mesenchymal transition (EMT). This suggested that the effects of fluid flow on conditioned media depend on flow intensity. Fluorescence resonance energy transfer (FRET)-based evaluation of Src activity and vinculin molecular force showed that osteopontin was involved in EMT and MET switching. A mouse model of tumorinduced osteolysis was tested using dynamic tibia loadings of 1, 2, and 5 N. The low 1 N loading suppressed tumor-induced osteolysis, but this beneficial effect was lost and reversed with loads at 2 and 5 N, respectively. Changing the loading intensities in vivo also led to changes in serum TGFβ levels and the composition of tumor-associated volatile organic compounds in the urine. Collectively, this study demonstrated the critical role of intensity-dependent mechanotransduction and osteopontin in tumorosteocyte communication, indicating that a biophysical factor can tangibly alter the behaviors of tumor cells in the bone microenvironment.

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Section: Strain Measurementmentioning

confidence: 99%

Skeletal loading regulates breast cancer-associated osteolysis in a loading intensity-dependent fashion

et al. 2020

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“…Material strain softening takes place during metal forming of ductile materials at room temperature due to the accumulation of damage [3,4,45,50] with plastic deformation or increased strain. About four decades ago, Gurson [51] studied the role of hydrostatic pressure in plastic deformation with emphasis on void nucleation and growth for porous ductile materials using the upper bound approach, revealing that plastic dilatation depends on porosity and that porosity can be nucleated during straining at second phases in a ductile matrix or at grain boundary misfits.…”

Section: Description Of Strain Softening Using the Second Strain Hardening Parametermentioning

confidence: 99%

“…Our experiences say that maximum strain at the last sample point ranges from 1.0 [10] to 1.5 for SCM435 [28] or SUS304 [44], and a sort of extrapolation is thus inevitable especially for automatic multi-stage cold forging where effective strain may exceed 4.0 at locally deformation-concentrated region. Very recently, Li et al [45] employed a special multi-camera DIC system to directly determine the true stress-strain curve over a large strain range from the tensile test of sheet specimen, revealing that there exists a distinct softening start point. It is noted that one strong point of material characterization using the tensile test is the possibility of revealing the mechanism of damage accumulation and fracture in the region of localized necking.…”

Section: Introductionmentioning

confidence: 99%

A Novel Flow Model of Strain Hardening and Softening for Use in Tensile Testing of a Cylindrical Specimen at Room Temperature

2021

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We develop a new flow model based on the Swift method, which is both versatile and accurate when used to describe flow stress in terms of strain hardening and damage softening. A practical issue associated with flow stress at room temperature is discussed in terms of tensile testing of a cylindrical specimen; we deal with both material identification and finite element predictions. The flow model has four major components, namely the stress before, at, and after the necking point and around fracture point. The Swift model has the drawback that not all major points of stress can be covered simultaneously. A term of strain to the third or fourth power (the “second strain hardening exponent”), multiplied and thus controlled by a second strain hardening parameter, can be neglected at small strains. Any effect of the second strain hardening exponent on the identification of the necking point is thus negligible. We use this term to enhance the flexibility and accuracy of our new flow model, which naturally couples flow stress with damage using the same hardening constant as a function of damage. The hardening constant becomes negative when damage exceeds a critical value that causes a drastic drop in flow stress.

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“…Photogrammetry is a relatively robust technique, but this method has limited accuracy and is difficult to meet the requirements of resolution [11,12]; Optical measurement includes digital holographic (DH), digital laser speckle correlation (DSCM), conventional DSPI, etc. [13,14,15,16]. Among these measurement methods, DH has been heralded as a new era of whole-field deformation analyses in a microscopic level [16,17,18], however, DH is susceptible to changes in the external environment, such as vibration, and air disturbance [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Strain Distribution Sensing System for Bone-Implant Interfaces Based on Digital Speckle Pattern Interferometry

Zhong

Yang

et al. 2019

Sensors

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This paper aims to provide an effective measurement method for the distribution of deformations and strains focusing on the response to external loading of bone-implant interfaces. To achieve this target, a novel speckle interference imaging method is proposed by introducing phosphate buffer saline medium, in which the samples were completely placed into a phosphate buffer saline solution medium to stable the water molecules. The stability of interferometry imaging is analyzed by using the concepts of co-occurrence matrix and moment of inertia. A series of experiments to measure load-driven deformation and strain in the bone-implant interface was carried out, and the experiments results were analyzed and discussed. It shows that the proposed method is feasible and effective for the no-contact strain measurements of biomaterials in a physiological condition. The proposed strain distribution sensing system will contribute to evaluating computational simulations and improving selection of implant designs and materials.

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A method of the direct measurement of the true stress–strain curve over a large strain range using multi-camera digital image correlation

Cited by 77 publications

References 16 publications

Skeletal loading regulates breast cancer-associated osteolysis in a loading intensity-dependent fashion

Skeletal loading regulates breast cancer-associated osteolysis in a loading intensity-dependent fashion

A Novel Flow Model of Strain Hardening and Softening for Use in Tensile Testing of a Cylindrical Specimen at Room Temperature

A Strain Distribution Sensing System for Bone-Implant Interfaces Based on Digital Speckle Pattern Interferometry

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