Directional damage and failure of composite materials under cyclic loading

2005 ◽  
Vol 39 (1/2) ◽  
pp. 163 ◽  
Author(s):  
Moez Chafra ◽  
Yvon Chevalier
Keyword(s):  
Composite Materials ◽  
Cyclic Loading ◽  
Damage And Failure

scholarly journals Verification of Brittle Fracture Criteria for Bimaterial Structures

2014 ◽  
Vol 8 (1) ◽  
pp. 44-48
Author(s):  
Grzegorz Mieczkowski ◽  
Krzysztof Molski
Keyword(s):  
Experimental Data ◽  
Composite Materials ◽  
Cyclic Loading ◽  
Brittle Fracture ◽  
Axial Loading ◽  
Loading Conditions ◽  
Fracture Criteria ◽  
Interfacial Cracks ◽  
Theoretical Results ◽  
Brittle Fracture Criteria

Abstract The increasing application of composite materials in the construction of machines causes strong need for modelling and evaluating their strength. There are many well known hypotheses used for homogeneous materials subjected to monotone and cyclic loading conditions, which have been verified experimentally by various authors. These hypotheses should be verified also for composite materials. This paper provides experimental and theoretical results of such verifications for bimaterial structures with interfacial cracks. Three well known fracture hypotheses of: Griffith, McClintock and Novozhilov were chosen. The theoretical critical load values arising from each hypotheses were compared with the experimental data including uni and multi-axial loading conditions. All tests were carried out with using specially prepared specimens of steel and PMMA.

scholarly journals Experimental Study on Structural Performance of RC Exterior Beam-Column Joints Retrofitted by Steel Jacketing and Haunch Element under Cyclic Loading Simulating Earthquake Excitation

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Cong-Thuat Dang ◽  
Ngoc-Hieu Dinh
Keyword(s):  
Cyclic Loading ◽  
Failure Load ◽  
Structural Performance ◽  
Dissipated Energy ◽  
Control Specimen ◽  
Seismic Capacity ◽  
Earthquake Excitation ◽  
Damage And Failure ◽  
Panel Zone ◽  
Energy Dissipation Capacity

Several retrofitting methods for reinforced concrete (RC) beam-column joints in old buildings without seismic details were developed. Four half-scale RC exterior beam-column joints were fabricated and tested under cyclic loading simulating earthquake excitation. The control specimen was designed to fail in joint shear. Two practical retrofitting strategies were applied to the control specimen which consider the architectural characteristic in real buildings, including steel jacketing and haunch retrofit solution. The structural performance of the test specimens was investigated in terms of various factors including damage and failure, load-drift relationship, ductility, dissipated energy, and strain profiles of longitudinal reinforcement. Experimental results confirmed that the proposed retrofit methods were shown to enhance the seismic capacity of the joints in terms of the strength, deformation capacity, and energy dissipation capacity while the shear deformation in the panel zone significantly reduced in comparison with the control specimen.

Preliminary Design of Tubular Composite Structures Using Netting Theory and Composite Degradation Factors

1995 ◽  
Vol 117 (4) ◽  
pp. 390-394 ◽  
Author(s):  
B. W. Tew
Keyword(s):  
Corrosion Resistance ◽  
Composite Materials ◽  
Cyclic Loading ◽  
Composite Structures ◽  
High Strength ◽  
Preliminary Design ◽  
Light Weight ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Design Calculations

Tubular products and process vessels built using fiber-reinforced composite materials provide significant advantages in applications that require corrosion resistance, high strength, and light weight. A design approach based on netting theory is presented which enables engineers to develop preliminary structural designs for these structures using composite materials. The integration of creep, cyclic loading, and environmental degradation factors into initial design calculations is also discussed and illustrated.

A PARIS LAW BASED MESH INDEPENDENT NUMERICAL METHODOLOGY FOR THE SIMULATION OF FATIGUE DRIVEN DELAMINATION IN COMPOSITES

2021 ◽  
Author(s):  
ANGELA RUSSO ◽  
ANDREA SELLITTO ◽  
ANIELLO RICCIO
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Cyclic Loading ◽  
Parametric Design ◽  
Fatigue Behavior ◽  
Numerical Procedure ◽  
Numerical Results ◽  
Fiber Reinforced Polymers ◽  
Time Step ◽  
Paris Law

Delamination evolution under cyclic loading is one of the most important research topics for the application of composite materials to aerospace, naval, automotive and, in general, transportation fields. Large experimental campaigns are needed to assess the fatigue behavior of Carbon Fiber Reinforced Polymers (CFRPs), which may result extremely time and cost consuming. Nevertheless, composite materials design needs to take into account the evolution of fatigue driven damage. Subsequently, the development of efficient and robust computational finite element methodologies to evaluate progression of delamination in composite structural components subjected to cyclic loading conditions has become relevant. In this paper, a numerical finite element procedure able to simulate the fatigue driven delamination growth is introduced. A Paris-law based cycle jump strategy, combined with the Virtual Crack Closure Technique (VCCT) approach, has been implemented in the commercial Finite Element Code ANSYS MECHANICAL via the Ansys Parametric Design Language (APDL). The main advantages of the proposed numerical procedure, named FT-SMXB, are related to its independence on the time step and element size in the frame of incremental analyses. The procedure has been preliminary validated, in this research study, at coupon level, by comparing the numerical results to literature experimental data on a unidirectional graphite/epoxy Double Cantilever Beam (DCB) specimen. The significant agreement between the obtained numerical results and the literature experimental benchmark data confirms the accuracy and the potential of the proposed methodology.

Effect of Cyclic Loading on the Bond Strength of Class II Restorations with Different Composite Materials

10.2341/07-65 ◽  
2008 ◽  
Vol 33 (2) ◽  
pp. 163-168 ◽  
Author(s):  
A. N. Cavalcanti ◽  
F. H. O. Mitsui ◽  
F. Silva ◽  
A. R. Peris ◽  
A. Bedran-Russo ◽  
...  
Keyword(s):  
Composite Materials ◽  
Cyclic Loading ◽  
Bond Strength ◽  
Clinical Relevance ◽  
Resin Composite ◽  
Clinical Situation ◽  
Class Ii ◽  
Selection Of

Clinical Relevance New resin composite technologies, such as nano-filled-based systems, have been developed. The assessment of such materials in a simulated laboratory chewing condition may assist with the selection of composites in a clinical situation.

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