Optimal Design of a Miniaturized Cruciform Specimen for Biaxial Testing of TA2 Alloys

Zhu, Zhikang; Lu, Zheng; Zhang, Peng; Fu, Wei; Zhou, Changyu; He, Xin

doi:10.3390/met9080823

Cited by 17 publications

(12 citation statements)

References 16 publications

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“…It was concluded in [1,6,16] that parameter identification from heterogeneous specimens outperforms the one using classical homogeneous tests, such as uniaxial tensile test. Experimental procedures performed in [2,11,[17][18][19] on this type of specimens also demonstrated its reliability. Furthermore, it was proved that heterogeneous mechanical tests can reduce the number of the required experimental classical tests for the material parameter identification [9].…”

Section: Intr Introduction Oductionmentioning

confidence: 70%

Design of heterogeneous interior notched specimens for material mechanical characterization

Conde¹,

Andrade‐Campos²,

Oliveira³

et al. 2021

Esaform 2021

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Nowadays, virtual predictions are essential in the design and development of new engineering parts. A critical aspect for virtual predictions is the accuracy of the constitutive model to simulate the material behavior. A state-of-the-art constitutive model generally involves a large number of parameters, and according to classical procedures, this requires many mechanical experiments for its accurate identification. Fortunately, this large number of mechanical experiments can be reduced using heterogeneous mechanical tests, which provide richer mechanical information than classical homogeneous tests. However, the test’s richness is much dependent on the specimen's geometry and can be improved with the development of new specimens. Therefore, this work aims to design a uniaxial tensile load test that presents heterogeneous strain fields using a shape optimization methodology, by controlling the specimen's interior notch shape. The optimization problem is driven by a cost function composed by several indicators of the heterogeneity present in the specimen. Results show that the specimen's heterogeneity is increased with a non-circular interior notch. The achieved virtual mechanical test originates both uniaxial tension and shear strain states in the plastic region, being the uniaxial tension strain state predominant.

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Section: Intr Introduction Oductionmentioning

confidence: 70%

Design of heterogeneous interior notched specimens for material mechanical characterization

Conde¹,

Andrade‐Campos²,

Oliveira³

et al. 2021

Esaform 2021

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show abstract

“…An IPBF-5000 series test machine of Tianjin Kair Measurement and Control Company (Tianjin, China) is used ( Figure 1 ) [ 22 ], and the specimen is shown in Figure 2 . A loading frequency of 0.2 Hz is used for all experiments, and the waveform is a sine wave.…”

Section: Biaxial Fatigue Crack Growth Testmentioning

confidence: 99%

Fatigue Crack Growth Behavior of CP-Ti Cruciform Specimens with Mixed Mode I-II Crack under Biaxial Loading

et al. 2022

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Investigations on the fatigue crack growth of commercial pure titanium are carried out with cruciform specimens under different biaxial load ratios (λ = 0, 0.5, and 1) and crack inclination angles (β = 90°, 60°, and 45°) in this paper. Based on the finite element results, the modified solution of stress intensity factors KI and KII for cruciform specimens containing mixed mode I-II crack is obtained by considering crack size, biaxial load ratio, and crack inclination angles. The experimental results show that the maximum tangential stress criterion is fit for the prediction of crack initiation angles for mixed model I-II crack under uniaxial or biaxial loading condition. When the biaxial load ratio increases, the crack propagation angle becomes smaller, and so does the fatigue crack growth rate of mode I crack or mixed mode I-II crack. Based on an equivalent stress intensity factor, a new valid stress intensity factor is proposed to better describe the biaxial fatigue crack growth behavior, which can demonstrate the contribution of mode I and mode II of stress intensity factor.

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“…Detailed dimensions of the uniaxial tensile specimen are shown in Figure 1b. To perform biaxial tensile tests, an improved cruciform specimen was developed according to standard BS ISO 16842 [29], as shown in Figure 1c, which has been proved to be able to provide homogeneous strain distribution in the gauge section [30]. The overall dimensions of the biaxial specimens are 100 × 100 × 1.6 mm with gauge area thickness of 0.4 mm.…”

Section: Tensile Testsmentioning

confidence: 99%

“…During the measure process, in order to decrease the error of the displacement measurement, the Gaussian prefiltering method was used. The obtained filtered images were analyzed by affine shape function and bicubic spline interpolation [30]. The colour scale presented in the present work varies from the minimum strain to the maximum strain, which is fixed by DIC system.…”

Section: Tensile Testsmentioning

confidence: 99%

Biaxial Tensile Behavior of Commercially Pure Titanium under Various In-Plane Load Ratios and Strain Rates

Zhang

Zhu

Zhou

et al. 2021

Metals

Self Cite

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The aim of the present work is to contribute to the characterization of the biaxial tensile behavior of commercially pure titanium, under various in-plane loading conditions at room temperature, by a non-contact digital image correlation system. Several loading conditions, with load ratio ranging from 4:0 to 0:4 and displacement rate ranging from 0.001 to 0.1 mm/s, are examined. It is found that the yield strength and ultimate tensile strength of biaxial sample are greater than that of uniaxial sample, where the equi-biaxial sample shows the highest strength. It is also observed that increase in strain rate leads to remarkable improvement of tensile strength. Fractographic analysis indicates that the shape and size of dimples are load ratio and strain rate dependent. Additionally, a modified Johnson–Cook constitutive model was proposed to account for the effect of strain rate on biaxial tensile deformation. The experimental results are in good agreement with the simulated results, indicating that the proposed model is reliable to predict biaxial tensile deformation of commercially pure titanium at different strain rates.

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Optimal Design of a Miniaturized Cruciform Specimen for Biaxial Testing of TA2 Alloys

Cited by 17 publications

References 16 publications

Design of heterogeneous interior notched specimens for material mechanical characterization

Design of heterogeneous interior notched specimens for material mechanical characterization

Fatigue Crack Growth Behavior of CP-Ti Cruciform Specimens with Mixed Mode I-II Crack under Biaxial Loading

Biaxial Tensile Behavior of Commercially Pure Titanium under Various In-Plane Load Ratios and Strain Rates

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