Strength failure criteria analysis for a flax fibre reinforced composite

2018 ◽  
Vol 124 ◽  
pp. 26-32 ◽  
Author(s):  
Rachel Koh ◽  
Bo Madsen
Keyword(s):  
Failure Criteria ◽  
Flax Fibre ◽  
Strength Failure ◽  
Reinforced Composite

Study of Sand Production Using Geomechanical and Hydro-Mechanical Models

2018 ◽  
Vol 876 ◽  
pp. 181-186
Author(s):  
Son Tung Pham
Keyword(s):  
Production Rate ◽  
Mechanical Model ◽  
Failure Criteria ◽  
Sand Production ◽  
Geomechanical Model ◽  
Strength Failure ◽  
Rate Versus ◽  
Mechanical Models ◽  
Rock Mechanical Properties ◽  
Bottomhole Pressure

Sand production is a complicated physical process depending on rock mechanical properties and flow of fluid in the reservoir. When it comes to sand production phenomenon, many researchers applied the Geomechanical model to predict the pressure for the onset of sand production in the reservoir. However, the mass of produced sand is difficult to determine due to the complexity of rock behavior as well as fluid behavior in porous media. In order to solve this problem, there are some Hydro – Mechanical models that can evaluate sand production rate. As these models require input parameters obtained by core analysis and use a large empirical correlation, they are still not used popularly because of the diversity of reservoirs behavior in the world. In addition, the reliability of these models is still in question because no comparison between these empirical models has been studied. The onset of sand production is estimated using the bottomhole pressure that makes the maximum effective tangential compressive stress equal or higher than the rock strength (failure criteria), which is usually known as critical bottomhole pressure (CBHP). Combining with Hydro – Mechanical model, the main objective of this work aims to develop a numerical model that can solve the complexity of the governing equations relating to sand production. The outcome of this study depicts sand production rate versus time as well as the change of porosity versus space and time. In this paper, the Geomechanical model coupled with Hydro – Mechanical model is applied to calibrate the empirical parameters.

Research Status of Concrete Strength Theory Based on Stress and Strain

2014 ◽  
Vol 670-671 ◽  
pp. 445-448
Author(s):  
Guo Jun Liu
Keyword(s):  
Failure Criterion ◽  
Concrete Strength ◽  
Failure Criteria ◽  
Practical Significance ◽  
Engineering Structures ◽  
Research Status ◽  
Advantages And Disadvantages ◽  
Strength Failure ◽  
Micro Cracks ◽  
Strain Space

In the civil engineering structures, when concrete structure withstand external loads, internal defects such as micro-cracks gradually developed, eventually will lead to the destruction of the concrete. Currently, there are two types of strength failure criterion of concrete, strength failure criterion based on stress-space and strength failure criterion based on strain-space, both of which have advantages and disadvantages, this paper introduces the research status of the two strength failure criteria of concrete, and the problems need further study in the future. It plays a strong practical significance in scientific research.

scholarly journals Considerations for the design of polymeric biodegradable products

2013 ◽  
Vol 33 (4) ◽  
pp. 293-302 ◽  
Author(s):  
André C. Vieira ◽  
Rui M. Guedes ◽  
Volnei Tita
Keyword(s):  
Experimental Data ◽  
Constitutive Models ◽  
Tensile Tests ◽  
Failure Criteria ◽  
Numerical Approach ◽  
Life Cycles ◽  
Strength Failure ◽  
First Order Kinetics ◽  
User Material Subroutine ◽  
Degradation Time

Abstract Several biodegradable polymers are used in many products with short life cycles. The performance of a product is mostly conditioned by the materials selection and dimensioning. Strength, maximum strain and toughness will decrease along its degradation, and it should be enough for the predicted use. Biodegradable plastics can present short-term performances similar to conventional plastics. However, the mechanical behavior of biodegradable materials, along the degradation time, is still an unexplored subject. The maximum strength failure criteria, as a function of degradation time, have traditionally been modeled according to first order kinetics. In this work, hyperelastic constitutive models are discussed. An example of these is shown for a blend composed of poly(L-lactide) acid (PLLA) and polycaprolactone (PCL). A numerical approach using ABAQUS is presented, which can be extended to other 3D geometries. Thus, the material properties of the model proposed are automatically updated in correspondence to the degradation time, by means of a user material subroutine. The parameterization was achieved by fitting the theoretical curves with the experimental data of tensile tests made on a PLLA-PCL blend (90:10) for different degradation times. The results obtained by numerical simulations are compared to experimental data, showing a good correlation between both results.

Fatigue Properties of Microelectronics Solder Joints

1991 ◽  
Vol 113 (2) ◽  
pp. 92-101 ◽  
Author(s):  
N. Nir ◽  
T. D. Dudderar ◽  
C. C. Wong ◽  
A. R. Storm
Keyword(s):  
Solder Joints ◽  
Low Cycle Fatigue ◽  
Failure Criteria ◽  
Mode Analysis ◽  
Fatigue Properties ◽  
Strength Failure ◽  
Loading System ◽  
Failure Mode Analysis ◽  
Post Test ◽  
Reversed Shear

Low cycle fatigue studies of solder joints designed and fabricated to represent generic interconnection structures typical of what might be used in packaging microelectronics have been carried out to assist in the development of a better understanding of the fundamental mechanical properties that determine the reliability of such structures. These studies involve micro scale joints (micro-joints) of both eutectic and 95/5 Pb/Sn solders fabricated by several different processes. In addition to a discussion of the results of recent tests reflecting specified loss-of-strength failure criteria and extensive post-test failure mode analysis of, primarily, 95/5 Pb/Sn micro-joints, descriptions of (1) the design and fabrication of the custom shear test vehicles and (2) the high-resolution electro-mechanical loading system used to apply cyclic loadings under isothermal conditions will be presented. This computer controlled system provides for the application of fully or partially reversed shear strains (with or without dwells) to either prototypes or custom test vehicles, and can be operated to maintain either total or plastic strain control during cycling.

scholarly journals Static, fatigue and impact behaviour of an autoclaved flax fibre reinforced composite for aerospace engineering

2020 ◽  
Vol 197 ◽  
pp. 108049 ◽  
Author(s):  
Tulio Hallak Panzera ◽  
Thomas Jeannin ◽  
Xavier Gabrion ◽  
Vincent Placet ◽  
Chrystel Remillat ◽  
...  
Keyword(s):  
Flax Fibre ◽  
Aerospace Engineering ◽  
Static Fatigue ◽  
Impact Behaviour ◽  
Reinforced Composite

Risk analysis in the design of timber portal frames with semi-rigid knee joints

2021 ◽  
Author(s):  
Lilita Ozola ◽  
Janis Fabriciuss
Keyword(s):  
Risk Analysis ◽  
Sustainable Design ◽  
Failure Criteria ◽  
Knee Joints ◽  
Affecting Factors ◽  
Grain Development ◽  
Wood Material ◽  
Complex Behaviour ◽  
Load Duration ◽  
Strength Failure

<p>The complex behaviour of anisotropic wood material and semi-rigid connections in knee joints of timber portal frames leads to a discussion on additional design conditions entailing strength failure criteria. Also the assessment of the consequences of deformation development and increase of global displacements of a system due to the load duration impact in semi-rigid connections is essentially important for a sustainable design. Some important affecting factors: the resistance of wood in tension perpendicular to the direction of the grain, development of deformations in semi- rigid connections and uncertainty of bearing capacity are examined regarding their role in a safety format.</p>

Effect of water ageing on the mechanical and damping properties of flax-fibre reinforced composite materials

2016 ◽  
Vol 152 ◽  
pp. 259-266 ◽  
Author(s):  
Khouloud Cheour ◽  
Mustapha Assarar ◽  
Daniel Scida ◽  
Rezak Ayad ◽  
Xiao-Lu Gong
Keyword(s):  
Composite Materials ◽  
Flax Fibre ◽  
Damping Properties ◽  
Effect Of Water ◽  
Reinforced Composite

DAMAGE ACCUMULATION IN FIBRE-REINFORCED COMPOSITE LAMINATES

1988 ◽  
Vol 12 (3) ◽  
pp. 133-137 ◽  
Author(s):  
P. LABOSSIERE ◽  
K.W. NEALE ◽  
K. NEGLO
Keyword(s):  
Finite Element ◽  
Circular Hole ◽  
Composite Laminates ◽  
Damage Accumulation ◽  
Progressive Failure ◽  
Failure Criteria ◽  
Progressive Damage ◽  
Fibre Breakage ◽  
Reinforced Composite ◽  
Finite Element Calculations

Finite element calculations are carried out to simulate progressive damage in fibre-reinforced composite laminates. Each element is taken to be linearly elastic up to failure, which is assumed to be caused by either fibre breakage, matrix rupture or delamination. These damage modes are modelled by incorporating Lee’s [2] failure criteria in the analysis. Behaviour subsequent to each type of damage is modelled by suitably modifying the element properties in the failure zones. Numerical results are present for the progressive failure of a four-layer symmetric cross-ply laminate with a circular hole.

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