Stress-Strain State Analysis of Layered Composite Materials with Localized Layer Breakage

Dmytro Kolosov; Ivan Belmas; Olena Bilous; Hanna Tantsura; Serhii Onyshchenko; Kateryna Antonova

doi:10.4028/p-g36CyI

Paper Titles

Effect of Mechanical Alloying on Structure and Hardness of FeCoNiCu Medium-Entropy Alloy
p.53

Multi-Criteria Decision-Making of EDM Parameters for Incoloy 800HT Alloy with Morphological Study
p.65

Influence of Laser Power and Transition Zone Distance on the Tensile Behaviour of a Bimetallic Specimen Manufactured by Selective Laser Melting
p.75

Advanced XRD Profiling of Residual and Total Stresses in Penstock Pipelines for Enhanced Structural Integrity
p.101

Study on Strength Optimization of CFRP Single-Lap Joints Based on Local Pre-Curing Effect
p.115

Research on Fracture Mechanics of Non-Reciprocal Adhesive in Composite Single-Lap Bonded Joints Based on UEL
p.127

Fracture Analysis in Pressure Vessels: The Role of Nozzle Offset
p.139

Damage in 3D Printed Polymeric Structures: The Trade Off in Printing Parameters and Damage Resistance
p.151

Stress-Strain State Analysis of Layered Composite Materials with Localized Layer Breakage
p.165

HomeKey Engineering MaterialsKey Engineering Materials Vol. 1036Stress-Strain State Analysis of Layered Composite...

Stress-Strain State Analysis of Layered Composite Materials with Localized Layer Breakage

Abstract:

Research purpose is in establishment of dependencies for parameters of a stress-strain state of a layered composite material with an arbitrary but finite amount of layers and a local breakage in continuity of the outermost layer. Research methodology is in construction of a mathematical model of interaction of hard and soft layers considering given arbitrary amount of layers and with a damaged hard layer and analytical solution of the model using methods of mechanics of composite materials. A character of stress redistribution in layers of a composite material with a local breakage of the outermost layer is established. A breakage in continuity of a hard layer leads to distortion of cross-sections of a sample. The damaged layer has larger displacements than the other ones. The uniform distribution of external loads among the layers is disturbed. Disturbance of a stress-strain state is localized both along the sample and along its thickness. Damage to the outermost layer leads to an increase in the tensile load of the adjacent layer by more than 60 % of the average load on layers. The two layers closest to the damaged one are loaded with a force that exceeds their average total load by almost 80 %. The breakage of the middle layer leads to smaller disturbances. The nature of local stress disturbances also depends on the amount of layers in a sample. As the total amount of layers increases, the extreme forces occurring in a sample with a damaged layer decrease to almost constant values if the amount of layers is at least ten. Scientific novelty is in establishing the dependencies for stress-strain state indicators on structural parameters of a composite tractive element with a local breakage of the outermost layer. The linear formulation of the problem and the principle of superposition make it possible to use the obtained dependencies in a case of applying force to one layer and fixing others. The obtained solutions allow determining a stress-strain state of a sample of layered structure and create conditions for implementing justified solutions regarding the conditions and permissibility of using belts of layered structure with layers damaged during operation, thus ensuring the safety of their use and making the most of their technical resource.