Scaled models for failure under impact loading

Sadeghi, Hamed; Davey, Keith; Darvizeh, Rooholamin; Darvizeh, A.

doi:10.1016/j.ijimpeng.2019.02.010

Cited by 49 publications

(79 citation statements)

References 29 publications

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“…For impact mechanics with strain hardening and strain-rate sensitive materials, recent researchers have developed several effective similarity systems [11,19,[21][22][23][24] to derive scaling factors. As a more concise, clear and effective system, the density-lengthvelocity (DLV) dimensional analysis system [23] was expressed as the seven main…”

Section: Previous Scaling Approachmentioning

confidence: 99%

“…Some different materials behaved good similarity, while others had significant errors [19]. A more comprehensive consideration for distortion of the different materials further including strain-hardening effects, temperature effects and failure are developed by Sadeghi et al [21,22], and a fixed strain and strain-rate window instead of the average strain and strain-rate was used to simplify the previous indirect difficulty. However, this method can only provide inexact prediction ability and usually result in obvious errors for similarity.…”

Section: Introductionmentioning

confidence: 99%

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Material similarity of scaled models

Wang

Zhang

et al. 2021

International Journal of Impact Engineering

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When different strain hardening and strain rate sensitive materials are used for scaled model and prototype, the traditional pure geometrical similarity laws of solid mechanics will fail. Although correcting the basic scaling factors of velocity, density and geometry have been developed to compensate for the material distortion in recent non-geometric scaling works, it is difficult to be widely used because of its inherent indirect (depending on the structural strain and strain rate responses) and inexact (having significant prediction errors for prototype) defects.In this paper, a framework of material similarity, based on the new suggested material dimensionless numbers and the 'Material number vs. strain/strain-rate' function curves, are further developed, which represents the objective requirement of similarity theory for the basic mechanical properties of materials. It is demonstrated what is similitude materials of solid mechanics and how to use the best similitude materials to overcome the non-scalabilities of materials for identical or different materials. The direct and exact solution of the basic correction factors is further obtained and therefore overcomes the previous inherent indirect and inexact defects radically. Based on the similarity evaluation of different materials of the classical

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Section: Previous Scaling Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Material similarity of scaled models

Wang

Zhang

et al. 2021

International Journal of Impact Engineering

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“…The new constitutive model for plate-like EMWM in a certain density and temperature range can be obtained by the combination of Equations (8), (16), (19), (23) and (25). Therefore, the new constitutive model can be expressed by Equation (27).…”

Section: Constitutive Model Verificationmentioning

confidence: 99%

“…The structure of the Johnson-Cook model is simple and the physical meaning of each term is clear. The Johnson-Cook model was used to describe the strength limit and failure process of metallic materials under large strain, high strain rate and high temperature [19][20][21]. Its expression is as follows:…”

Section: Introductionmentioning

confidence: 99%

A Constitutive Model of Plate-Like Entangled Metallic Wire Material in Wide Temperature Range

Ding

Bai

et al. 2019

Materials

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Entangled metallic wire material (EMWM) is a kind of porous damping material. To promote the engineering application of EMWM, it is necessary to establish the constitutive model of EMWM to estimate its mechanical properties. In this paper, a series of quasi-static compression experiments for plate-like EMWM specimens made of austenitic stainless steel wire (06Cr19Ni10) with different densities were carried out in the temperature range of 20–500 °C. It was found that the stiffness of the plate-like EMWM would increase with the increases in the ambient temperature. The non-linear characteristics of the force–displacement curve of the plate-like EMWM would be weakened. Taking the spatial structural characteristics of the plate-like EMWM and the influence of the thermal expansion of the structure into account, a new constitutive model for plate-like EMWM was presented by the combination of the Johnson–Cook model and the Sherwood–Frost constitutive framework model. The accuracy of the model was verified by the experimental data under different temperatures. The results show that the calculated results of the model are consistent with the experimental results. This model can provide an effective theoretical basis for predicting the mechanical properties of plate-like EMWM and guiding its design.

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“…However, it is very difficult to manufacture a complete dynamic similar model of QCC in the above-scale ratio range as the geometric size of each component in QCC cannot be magnified or reduced in equal proportions. Although the method of adding mass [2,3], amplifying input acceleration peak [4] and adjusting the section moment of inertia [5,6], was used to satisfy the similarity design, these methods have their limitations; for example, the method of adding mass has a negative influence on the QCC stability of overall structure.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Verification of a 1/20 Scale Model of Quayside Container Crane Using Distortion Theory

2019

Shock and Vibration

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The scale model is an effective method to research the performance of quayside container crane (QCC) under the seismic condition, but the model distortion usually exists in the similar design process which leads to the incomplete similarity between the scale model and prototype. In this investigation, the distortion theory and the prediction coefficient correction method are used to upgrade the quality of 1/20 QCC scale model and, then, the seismic response of the QCC prototype is obtained from the shake table scale model test. In the first step, the similarity ratio of the 1/20 QCC scale model is calculated by the similitude law and the size of scale model is obtained from the similarity constants. In the second step, the bending stiffness is selected and determined as the distortion term and, then, the relationship between the distortion coefficient and the prediction coefficient is obtained by the finite element prediction coefficient method. Furthermore, the three different scale models are manufactured and tested in the shake table experiment under different seismic conditions. It is found that the experimental test results are consistent with the numerical simulation results of the QCC prototype. It can be concluded that the QCC scale model can be used to predict the performance of the prototype under the different seismic conditions after corrected by distortion theory, and the distortion theory is an effective method to solve the incomplete similarity between the scale model and prototype.

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Scaled models for failure under impact loading

Cited by 49 publications

References 29 publications

Material similarity of scaled models

Material similarity of scaled models

A Constitutive Model of Plate-Like Entangled Metallic Wire Material in Wide Temperature Range

Design and Experimental Verification of a 1/20 Scale Model of Quayside Container Crane Using Distortion Theory

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