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fracture toughness

Emilio Martínez Pañeda's picture

Damage modeling in Small Punch Test specimens

I hope some of you may find this work interesting:

Damage modeling in Small Punch Test specimens

E. Martínez-Pañeda, I.I. Cuesta, I. Peñuelas, A. Díaz, J.M. Alegre

Theoretical and Applied Fracture Mechanics, 86A, pp. 51-60

http://www.sciencedirect.com/science/article/pii/S0167844216301616

A pre-print is available at www.empaneda.com

Amir Abdollahi's picture

Fracture toughening and toughness asymmetry induced by flexoelectricity

Cracks generate the largest strain gradients that any material can withstand. Flexoelectricity (coupling between strain gradient and polarization) must therefore play an important role in fracture physics. Here we use a self-consistent continuum model to evidence two consequences of flexoelectricity in fracture: the resistance to fracture increases as structural size decreases, and it becomes asymmetric with respect to the sign of polarization. The latter phenomenon manifests itself in a range of intermediate sizes where piezo- and flexoelectricity compete.

hlfrandsen's picture

PhD scholarship in Improvement of Cell Strength in High Temperature Electrolysis Cells

The section for Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark, is seeking a candidate for a PhD student position as part of the project “Synfuel: Sustainable synthetic fuels from biomass gasification and electrolysis”.

Yuli Chen's picture

Effects of geometrical and mechanical properties of fiber and matrix on composite fracture toughness

Composites reinforced by thinner fibers are intensively studied in recent years and expected to have better
mechanical properties. With development of nanotechnology, the diameter of fiber can be as thin as
several nanometers, such as nanofibers and nanotubes. Then, do these thinner fibers definitely result in
composites with better mechanical properties? In this paper, the toughening effect of reinforcing fibers in
composites is investigated based on the three-level failure analysis model. It is found that thinner

Plastic J significance in CTOD equation

I am working on the validation of CTOD.

In the evaluation of CTOD using the
J-integral approach as applied in ASTM E1290 and E1820, the plastic J
component is defined as (Npl*Apl)/(Bn*Bo)
Npl=dimensionless constant(plasticity)
Apl=area under load vs. displacement plot
Bn=ligamen length (W-a)
Bo=section thickness

On E1820 there are different functions provided for Npl if Apl is
evaluated differently (CMOD or load-line displacement).

nasibehn's picture

Fracture toughness of cast aluminum A383-T5

Hi All,

Does anybody know where I can get the fracture toughness of cast Aluminum A383-T5? Any standard?

 Thanks,

Nasib

How to plot Fracture toughness vs Crack length in Abaqus for Delamination problem

I've modelled a DCB specimen and applied Boundary conditions and load... I followed the same procedures given in abaqus documentation... As expected the crack initiates and propagates along the interface... I can get the Resultant force vs displacement plot from the analysis.. But i dont know how to plot the fracture toughness vs crack length plot in ABAQUS..

Please help me... Your suggestion would really help me a lot..

Tensile testing curve and fracture toughness relation

Hello everyone,
I am studying fracture of polymer composites.
I had a question I want to relate fracture toughness of composite to the composite stress-strain curve found from simple tensin test(on samples with no notch or pre-existing crack), can anyone give me a hint , how to do it?

NANOVEA's picture

Nanoindentation Fracture Toughness

The ability of a material to resist cracking, or fracture, has been vital to the studies of fracture mechanics. Until recently the study of fracture toughness has been analyzed at a macro range using powerful instrumentation applied to large samples.

NANOVEA's picture

Microindentation & Fracture of Mineral Rock

The use of Microindentation has proven to be a crucial tool for rock mechanics related studies. For example, Microindentation has been used to advance studies in excavation by allowing further understanding of rock mass properties and its separation. Microindentation has been used to advance drilling studies to improve drill heads and improve drilling procedures. Microindentation has also been used to study chalk and powder formation from minerals.

pflines's picture

puzzle in the asymmetric four-point-bend sepcimens.

HI, everyone,

 This is pflines, i am working on the mode I\II fracture toughness.

i want to use the asymmetric four-point-bend sepcimens to get the value of KI and KII,

 but did not found a clear formulation to caculate the KI and KII,

 anyone could help me?

Fracture toughness of wood in mode II

Hi everybody,

I have done some experiments on the fracture toughness in mode II of wood specimens using attached geometry;so using

formula KIIc= 5.11P(3.1415*a)^0.5 /(2BW) I was able to calculate the frcature toughness of wood, but I am quite suprised

why this equation does not iclude depth of the specimens and moreover, I think that I have obtained higher values for the

fracture toughnes values. Is there any other formulation for obtaining the fracture toughness in mode II for this specimen?

P.s. dimension of my specimens is 100*100*63mm

shirangi's picture

Effect of Residual stresses on the Interfacial Fracture Toughness of polymer/Metal Interface

When a bi-material sample for the characterization of interfacial fracture toughness is manufactured, the sample is not usually stress-free at room temperature. If an interface between a metallic substrate and a polymeric adhesive is considered, there are essentially two sources of residual stresses for a dry sample at room temperature:

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