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MULTISCALE HYBRID ELEMENT MODELING OF TRIAXIAL BRAIDED COMPOSITE

Sun, Mingkun, Sun
http://rave.ohiolink.edu/etdc/view?acc_num=akron1533550804106857

Abstract Details

2018, Doctor of Philosophy, University of Akron, Civil Engineering.
Composite materials have been widely used in the aerospace industry, automobile manufacturing, and other commercial applications, due to their high strength, light weight and low cost. The two-dimensional triaxial braided composite (2DTBC), one of the widely used types of composite materials, is a quasi-isotropic structure which exhibits equal material stiffness properties in all directions. 2DTBC has been used to manufacture jet engine fan cases and fan blades in the aerospace industry. However, conducting experimental tests of 2DTBC under dynamic impact is time consuming and expensive. Numerical simulation provides an efficient way to investigate composite material response under ballistic impact loading. The goal of the work in this study is to develop a sophisticated multiscale model to investigate the penetration velocity and panel deflection behavior of a composite structure under various impact velocities as well as to study damage mechanisms under ballistic impact loading conditions. A meso-scale model discretized using three dimensional solid element was generated to account for realistic geometry of the braiding fiber tows and was applied at the critical impact region to account for the impact damage mechanism. Micromechanical finite element models were used to predict the effective material properties for the unidirectional composite. Under the multiscale scheme, a macro-scale model using a simplified geometry in which the braiding architecture of the fiber tows is only accounted for in an approximate manner was incorporated at the region away from the critical region to enhance the computational efficiency of the whole numerical model. The entire multiscale model was created within the context of a finite element program, Ls-DYNA, which has been widely used by the aerospace industry to simulate bird strikes and jet engine blade-out events due to its reliable explicit time integration algorithm and robust contact algorithm. In this work, thoroughly investigation involving static tensile test and ballistic impact test was carried out on two composite material systems, T700s/E862 and T700s/PR520. Six-layer straight sided coupon bar tensile tests for both material systems were validated and correlated with experimental results very well. Then the validated multiscale model was applied to investigate the flat panel ballistic impact test. The penetration velocity threshold, damage mechanism under various impact velocity, and the delamination were intensively studied. The numerical analysis results of the two different composite systems were discussed and compared to each other to find out the effect of polymer resin on the mechanical behavior of the composite under dynamic impact loading. At last, the sensitive studies regarding to several internal parameters were carried out in order to better understand and control of the multiscale model.
Wieslaw Binienda (Advisor)
174 p.
Aerospace Materials
Triaxially braided composite; finite-element analysis; multi-scale; impact

Recommended Citations

Citations

  • Sun, Sun, M. (2018). MULTISCALE HYBRID ELEMENT MODELING OF TRIAXIAL BRAIDED COMPOSITE [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533550804106857

    APA Style (7th edition)

  • Sun, Sun, Mingkun. MULTISCALE HYBRID ELEMENT MODELING OF TRIAXIAL BRAIDED COMPOSITE . 2018. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1533550804106857.

    MLA Style (8th edition)

  • Sun, Sun, Mingkun. "MULTISCALE HYBRID ELEMENT MODELING OF TRIAXIAL BRAIDED COMPOSITE ." Doctoral dissertation, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533550804106857

    Chicago Manual of Style (17th edition)

akron1533550804106857
487
© 2018, some rights reserved.Creative Commons License MULTISCALE HYBRID ELEMENT MODELING OF TRIAXIAL BRAIDED COMPOSITE by Mingkun Sun Sun is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.