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# Mechanics of Composite Materials (v.45, #2)

Exact analytical and numerical solutions of stability problems for a straight composite bar subjected to axial compression and torsion by V. N. Paimushin; V. A. Ivanov; S. A. Lukankin; N. V. Polyakova; V. A. Firsov; S. A. Kholmogorov (

*pp. 113-136*).

**Keywords:** straight bar; compression and torsion; Timoshenko model; exact analytical solutions; numerical solutions; experiment

Effect of long-term exposure to water on the viscoelastic properties of an epoxy-based composition by K. Aniskevich; R. Krastev; Yu. Hristova (

*pp. 137-144*).

**Keywords:** polymer; viscoelasticity; exposure to water; stress relaxation; reduction function

A model for predicting the multiscale crack growth due to an impact in heterogeneous viscoelastic solids by F. V. Souza; D. H. Allen (

*pp. 145-152*).

**Keywords:** multiscale model; heterogeneous viscoelastic media; dynamic/impact loading; fracture

Multicriteria optimization of a composite cylindrical shell subjected to longitudinal thermal stresses and buckling under the action of torque by G. Teters (

*pp. 153-158*).

**Keywords:** composite cylindrical shell; external torque; thermal stresses; multicriteria optimization

A variational principle in a geometrically nonlinear theory of heterogeneous viscoelastic shells by R. Yu. Amenzadeh (

*pp. 159-164*).

**Keywords:** multilayer shell; tensors of instantaneous compliance; creep operators

Measuring and modeling the thermal conductivities of three-dimensionally woven fabric composites by J. Schuster; D. Heider; K. Sharp; M. Glowania (

*pp. 165-174*).

**Keywords:** textile composites; thermal properties; modeling; finite-element analysis

Polytetramethylene glycol-modified polycyanurate matrices reinforced with nanoclays: synthesis and thermomechanical performance by G. I. Anthoulis; E. Kontou; A. Fainleib; I. Bei (

*pp. 175-182*).

**Keywords:** polycyanurate; organoclay; thermomechanical properties

Stress distribution in an infinite elastic body with a covered periodically curved fiber by R. Kosker; D. M. Dikbas (

*pp. 183-198*).

**Keywords:** fibrous composite; covering material; geometrical nonlinearity; normal stresses

Polyetheretherketone (PEEK) nanocomposites for extreme mechanical and tribological loads by N. Knör; A. Gebhard; F. Haupert; A. K. Schlarb (

*pp. 199-206*).

_{2})-reinforced polyetheretherketone (PEEK) composites for use under extreme mechanical and tribological loads were developed and investigated systematically. The nanocomposites were manufactured with particle concentrations of 1 to 15 vol.% by using an optimized twin-screw extrud er technology. A simultaneous increase in the strength and elastic modulus of PEEK and an improvement in the tribological properties of PEEK/ZnS compounds were observed. Also, the specific wear rate decreased with increasing ZnS content, reaching its minimum at 3 vol.%. This minimum corresponded to a 60% reduction in the wear rate com pared with that of the neat PEEK. A wear map was re corded for the 3 vol.% composite, which depicted the in fluence of the sliding speed and the normal force on the wear rate over a wide range of parameters.

**Keywords:** nanocomposite; stiffness; strength; wear rate; abrasion resistance

Analytical and numerical techniques for predicting the interfacial stresses of wavy carbon nanotube/polymer composites by K. Yazdchi; M. Salehi; M. M. Shokrieh (

*pp. 207-212*).

**Keywords:** carbon nanotubes; interfacial stresses; nanocomposites; fiber waviness