ORALS

SESSION: MultiscaleTuePM3-R8	Horstemeyer International Symposium (7th Intl. symp. on Multiscale Material Mechanics & Sustainable Applications)
Tue. 29 Nov. 2022 / Room: Similan 1
Session Chairs: Katerina Aifantis; Romesh Batra; Session Monitor: TBA

17:50: [MultiscaleTuePM313] OL Plenary
Tailoring of Mooney-Rivlin Parameters for Optimal Stress Distribution during Bending and Radial Expansion of Cylinders and Spheres
Romesh Batra¹ ; ¹Department of Biomedical Engineering & Mechanics , Virginia Polytechnic Institute and State University, Virginia, United States;
Paper Id: 264 [Abstract]

A challenging issue in solid mechanics is to optimally designing lightweight structures. One way to achieve this is to have either one or more components of the stress tensor or the effective stress or strain uniform throughout the structure with the choice depending upon the adopted failure criterion. Having succeeded in doing so for incompressible and heterogeneous Hookean materials we now explore the possibility of tailoring in the radial direction the two moduli for the Mooney-Rivlin material for achieving this.

References:
R.C. Batra, Material Tailoring and Universal Relations for Axisymmetric Deformations of Funtionally Graded Rubberlike Cylinders and Spheres, Mathematics and Mechanics of Solids, 16, 729-738, 2011.

R.C. Batra, Material tailoring in three-dimensional flexural deformations of functionally graded material beams, Composite Structures, 259, Art. No. 113232, 2021.

SESSION: MultiscaleWedPM3-R8	Horstemeyer International Symposium (7th Intl. symp. on Multiscale Material Mechanics & Sustainable Applications)
Wed. 30 Nov. 2022 / Room: Similan 1
Session Chairs: TBA Session Monitor: TBA

18:15: [MultiscaleWedPM314] OL
Optimum air blast mitigating sandwich structures with fiber-reinforced face-sheets and foam core
Romesh Batra¹ ; ¹Department of Biomedical Engineering & Mechanics , Virginia Polytechnic Institute and State University, Virginia, United States;
Paper Id: 557 [Abstract]

Conflicts in different parts of the world and impacts among fast moving objects produce extreme loads of very high intensity but of short duration that severely damage structures. A goal of this work to design lightweight sandwich structures that successfully protect the object to which they are strongly bonded. Realizing that design by experimentally testing several prototypes is very expensive, we use the finite element method to first ensure that the mathematical model of the problem predicts results close to test findings. Subsequently, we couple it with an optimization algorithm to find the lay-up and the thickness of 8 core layers and the fiber-reinforced face sheets to simultaneously minimize the mass and maximize either the back face deflection or the force transmitted to the rigid body perfectly bonded to the rear face-sheet. It is found that in the core the mass density and the mechanical properties do not continuously vary through the thickness.

References:
B. Alanbay, R.C. Batra, Optimization of blast mitigating sandwich structures with fiber-reinforced face sheets and PVC foam layers as core, Thin-Walled Structures, 179 (2022) 109721

L. Yuan, R.C. Batra, Optimum first failure load design of one/two-core sandwich plates under blast loads, and their ultimate loads, Composite Structures, Vol. 224, Art. No. 111022, 2019

Anup Pydah, R.C. Batra, Blast loading of bumper shielded hybrid two-core Miura-ori/honeycomb core sandwich plates, Thin-Walled Structures 129 (2018) 45–57