The Experts below are selected from a list of 108765 Experts worldwide ranked by ideXlab platform
Daining Fang - One of the best experts on this subject based on the ideXlab platform.
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yield and Failure Theory for unidirectional polymer matrix composites
Composites Part B-engineering, 2019Co-Authors: Hongshuai Lei, Daining Fang, Yanfei Chen, Yunong Zhao, Liqun TangAbstract:Abstract This paper presents a unified Theory of yield and Failure criteria for unidirectional polymer-matrix composites (UD PMCs). This interactive unified Theory considers the effect of normal stress on the shear strength by introducing a coupling term ( q 3 σ 22 | τ 21 | ). The coefficient q 3 of the coupling term is an empirical value and equals to 0.2. The predictions of the unified Theory are well agreeable with present and existing experiments. Furthermore, Tao Theory has been improved by adding the limiting condition that the ratio of compressive strength to shear strength should be greater than two.
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experimental and theoretical studies on inter fiber Failure of unidirectional polymer matrix composites under different strain rates
International Journal of Solids and Structures, 2017Co-Authors: Yong Tao, Haosen Chen, Kai Yao, Hongshuai Lei, Yongmao Pei, Daining FangAbstract:Abstract Polymer-matrix composites (PMCs) are widely used in many fields. However, the accurate characterization of their Failure behavior is still a challenge. At present, the inter-fiber Failure of unidirectional PMCs under compression is not well predicted, and the corresponding strain rate dependent Failure Theory remains less explored. This paper aims to study and characterize the inter-fiber Failure behavior of unidirectional PMCs under different strain rates. Unidirectional glass/epoxy specimens with various off-axis angles were tested at three strain rates (quasi-static, 383 and 646 s−1), and the measured strain rate dependent strength is modelled by an empirical formula. To evaluate the test results, a new Failure Theory that incorporates strain rate effects is proposed. The Theory is developed based on three different Failure modes, with each represented by a new and simple formula. Comparison shows that the predicted Failure envelopes and fracture angles are in excellent agreement with the experimental results.
Yanfei Chen - One of the best experts on this subject based on the ideXlab platform.
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yield and Failure Theory for unidirectional polymer matrix composites
Composites Part B-engineering, 2019Co-Authors: Hongshuai Lei, Daining Fang, Yanfei Chen, Yunong Zhao, Liqun TangAbstract:Abstract This paper presents a unified Theory of yield and Failure criteria for unidirectional polymer-matrix composites (UD PMCs). This interactive unified Theory considers the effect of normal stress on the shear strength by introducing a coupling term ( q 3 σ 22 | τ 21 | ). The coefficient q 3 of the coupling term is an empirical value and equals to 0.2. The predictions of the unified Theory are well agreeable with present and existing experiments. Furthermore, Tao Theory has been improved by adding the limiting condition that the ratio of compressive strength to shear strength should be greater than two.
Richard N. Christensen - One of the best experts on this subject based on the ideXlab platform.
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The Failure Theory for Isotropic Materials: Proof and Completion
Journal of Applied Mechanics, 2019Co-Authors: Richard N. ChristensenAbstract:Abstract This work represents the completion of the many developments in recent years on Failure Theory for homogeneous and isotropic materials. Presented here is the resulting Failure formalism in final and technically complete form. Significant further results are also given for the verification of the Failure formalism. The scope of this paper goes from the history of misguided Failure Theory investigations right up to the present final tested forms ready for applications. For every predicted Failure level in terms of the stresses, there is an accompanying ductility level. This ranges from brittle Failure up to fully ductile Failure. The entire Theory is calibrated by only two specified parameters (Failure properties). Nothing else is needed. The seemingly interminable, actually centuries long search for the missing Theory of Failure has finally been brought to a resolute and successful conclusion.
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materials Failure Theory strain energy and the principal stresses eigenvalue problem how these three historical areas are interrelated and mutually reinforcing thus enabling new results for materials Failure
Mathematics and Mechanics of Solids, 2019Co-Authors: Richard N. ChristensenAbstract:The three sub-disciplines of principal stresses, strain energy, and Failure Theory are shown to depend upon four basic invariants. These four invariants are derived from the eigenvalue problem of t...
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Proof of the Splitting Mode of Compressive Brittle Failure and Integration With General Failure Theory
Journal of Applied Mechanics, 2019Co-Authors: Richard N. ChristensenAbstract:The problem of special interest is the nature of the mode of Failure in uniaxial compression at the brittle limit. This problem is known by observation to undergo a splitting mode of Failure. The present work gives a full theoretical treatment and proof for this mode of Failure. The general Failure Theory of Christensen for isotropic materials provides the basis for the derivation. The solution demonstrates the depth of technical capability that is required from the Failure Theory to treat such a classically difficult problem.
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an evaluation of the Failure modes transition and the christensen ductile brittle Failure Theory using molecular dynamics
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2018Co-Authors: Richard N. Christensen, Zhi LiAbstract:The Christensen ductile/brittle Failure Theory can be interpreted in terms of the associated Failure modes, those of shear bands and voids nucleation. Their conjunction is then termed as the failur...
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An evaluation of the Failure modes transition and the Christensen ductile/brittle Failure Theory using molecular dynamics
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2018Co-Authors: Richard N. Christensen, Zhi LiAbstract:The Christensen ductile/brittle Failure Theory can be interpreted in terms of the associated Failure modes, those of shear bands and voids nucleation. Their conjunction is then termed as the failur...
Hongshuai Lei - One of the best experts on this subject based on the ideXlab platform.
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yield and Failure Theory for unidirectional polymer matrix composites
Composites Part B-engineering, 2019Co-Authors: Hongshuai Lei, Daining Fang, Yanfei Chen, Yunong Zhao, Liqun TangAbstract:Abstract This paper presents a unified Theory of yield and Failure criteria for unidirectional polymer-matrix composites (UD PMCs). This interactive unified Theory considers the effect of normal stress on the shear strength by introducing a coupling term ( q 3 σ 22 | τ 21 | ). The coefficient q 3 of the coupling term is an empirical value and equals to 0.2. The predictions of the unified Theory are well agreeable with present and existing experiments. Furthermore, Tao Theory has been improved by adding the limiting condition that the ratio of compressive strength to shear strength should be greater than two.
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experimental and theoretical studies on inter fiber Failure of unidirectional polymer matrix composites under different strain rates
International Journal of Solids and Structures, 2017Co-Authors: Yong Tao, Haosen Chen, Kai Yao, Hongshuai Lei, Yongmao Pei, Daining FangAbstract:Abstract Polymer-matrix composites (PMCs) are widely used in many fields. However, the accurate characterization of their Failure behavior is still a challenge. At present, the inter-fiber Failure of unidirectional PMCs under compression is not well predicted, and the corresponding strain rate dependent Failure Theory remains less explored. This paper aims to study and characterize the inter-fiber Failure behavior of unidirectional PMCs under different strain rates. Unidirectional glass/epoxy specimens with various off-axis angles were tested at three strain rates (quasi-static, 383 and 646 s−1), and the measured strain rate dependent strength is modelled by an empirical formula. To evaluate the test results, a new Failure Theory that incorporates strain rate effects is proposed. The Theory is developed based on three different Failure modes, with each represented by a new and simple formula. Comparison shows that the predicted Failure envelopes and fracture angles are in excellent agreement with the experimental results.
Kai Yao - One of the best experts on this subject based on the ideXlab platform.
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experimental and theoretical studies on inter fiber Failure of unidirectional polymer matrix composites under different strain rates
International Journal of Solids and Structures, 2017Co-Authors: Yong Tao, Haosen Chen, Kai Yao, Hongshuai Lei, Yongmao Pei, Daining FangAbstract:Abstract Polymer-matrix composites (PMCs) are widely used in many fields. However, the accurate characterization of their Failure behavior is still a challenge. At present, the inter-fiber Failure of unidirectional PMCs under compression is not well predicted, and the corresponding strain rate dependent Failure Theory remains less explored. This paper aims to study and characterize the inter-fiber Failure behavior of unidirectional PMCs under different strain rates. Unidirectional glass/epoxy specimens with various off-axis angles were tested at three strain rates (quasi-static, 383 and 646 s−1), and the measured strain rate dependent strength is modelled by an empirical formula. To evaluate the test results, a new Failure Theory that incorporates strain rate effects is proposed. The Theory is developed based on three different Failure modes, with each represented by a new and simple formula. Comparison shows that the predicted Failure envelopes and fracture angles are in excellent agreement with the experimental results.
