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# Mechanics of Composite Materials (v.41, #5)

Mode II Delamination of a Unidirectional Carbon Fiber/Epoxy Composite in Four-Point Bend End-Notched Flexure Tests by E. Zile; V. Tamuzs (

*pp. 383-390*).

**Keywords:** four-point bend end-notched flexure; delamination; Mode II; cohesive elements

Interaction of Plane Stress Waves in a Three-Layer Structure. 1. Degenerate Solutions in Terms of Characteristics for a Homogeneous Structure by V. A. Polyakov; R. P. Shlitsa; V. V. Khitrov; V. I. Zhigun (

*pp. 391-406*).

_{0}(variant 2). For the boundary conditions of variant 1, relationships are obtained which allow one to reduce the analytical continuation of a solution in time to a periodic procedure if solely the initial disturbances of the strain field in the layers are given. It is shown that, in this case, the Cauchy problem with the initial strain field is reduced to graphoanalytically constructing the superposition patterns of the forward and backward waves. The fundamental features of the construction are demonstrated for a uniform bar with a piecewise constant distribution of strains along its length. To solve the problem of impact loading in variant 2, analytical results for a uniform plate are used, which allows us to account for the direction of mass forces in collision. In the latter case, the possibility of mass recoil is revealed in the first and second time cycles. The analytical constructions presented are focused on an exact calculation of stresses upon response of a layered plate to initial disturbances within its layers, as well as to an external dynamic action.

**Keywords:** layered structure; wave problem; graphoanalytical method in terms of characteristics; transverse normal stress

Predicting the Deformability of Expanded Polystyrene in Long-Term Compression by I. J. Gnip; V. I. Kersulis; S. I. Vaitkus (

*pp. 407-414*).

_{c}(t = 15) of the EPS is determined based on empirically estimating the long-term creep of this material subjected to a compressive stress σ

*c*

_{ }= 0.3σ

_{10%}for 15 years. A relationship between $$ar J$$

_{c}(t = 15) and EPS density in the slabs is established.

**Keywords:** interval prediction; creep; creep compliance; long-term compression; slabs of expanded polystyrene

Large Elastic Strains of Plastic Foams by D. A. Chernous; S. V. Shil'ko (

*pp. 415-424*).

**Keywords:** foams; implants; volume fraction of solid phase; structural element; effective Young's modulus; nonlinear elastic deformation; loss of stability

Comparative Studies on the Mechanical Properties of a Thermoset Polymer in Tension and Compression by R. D. Maksimov; E. Z. Plume; J. O. Jansons (

*pp. 425-436*).

**Keywords:** polyester resin; tension; compression; strength; elastic modulus; Poisson ratio; creep

Stability of Composite Cylindrical Shells with Noncoincident Directions of Layer Reinforcement and Coordinate Lines by N. P. Semenyuk; V. M. Trach (

*pp. 437-444*).

**Keywords:** composite cylindrical shells; stability; axial compression; external pressure; torsion; one plane of symmetry

Analysis of Thick Laminated Composite Plates on an Elastic Foundation with the Use of Various Plate Theories by S. S. Akavci (

*pp. 445-460*).

**Keywords:** laminate; composite; plate; shear; Winkler; Pasternak

Multicriteria Optimal Design of a Rectangular Composite Plate Subjected to Biaxial and Thermal Loading by G. Teters (

*pp. 461-466*).

**Keywords:** multicriteria optimization; composite plate; thermal action; biaxial loading

The Method of Three-Point Bending in Testing Thin High-Strength Reinforced Plastics at Large Deflections by A. K. Arnautov (

*pp. 467-476*).

**Keywords:** advanced composites; test methods; thin bar; analytical model; three-point bending; large deflections; tension; strength