iMechanica - ctod
https://imechanica.org/taxonomy/term/9602
enFracture toughness characterization through notched small punch test specimens
https://imechanica.org/node/19406
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/7195">Small punch test</a></div><div class="field-item odd"><a href="/taxonomy/term/1978">fracture toughness</a></div><div class="field-item even"><a href="/taxonomy/term/545">damage</a></div><div class="field-item odd"><a href="/taxonomy/term/1251">finite elements</a></div><div class="field-item even"><a href="/taxonomy/term/9602">ctod</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>I hope some of you may find this work interesting.</p>
<p>Fracture toughness characterization through notched small punch test specimens</p>
<p><a href="http://www.sciencedirect.com/science/article/pii/S0921509316300740">http://www.sciencedirect.com/science/article/pii/S0921509316300740</a></p>
<p>(A preprint version is available at <a href="http://www.empaneda.com">www.empaneda.com</a>)</p>
<p> In this work a novel methodology for fracture toughness characterization by means of the small punch test (SPT) is presented. Notched specimens are employed and fracture resistance is assessed through a critical value of the notch mouth displacement Xspt. Finite element simulations and interrupted experiments are used to track the evolution of Dspt as a function of the punch displacement. The onset of crack propagation is identified by means of a ductile damage model and the outcome is compared to the crack tip opening displacement estimated from conventional tests at crack initiation. The proposed numerical-experimental scheme is examined with two different grades of CrMoV steel and the differences in material toughness captured. Limitations and uncertainties arising from the different damage phenomena observed in the lowest toughness material examined are thoroughly discussed.</p>
<p> </p>
</div></div></div>Sat, 30 Jan 2016 07:55:11 +0000Emilio Martínez Pañeda19406 at https://imechanica.orghttps://imechanica.org/node/19406#commentshttps://imechanica.org/crss/node/19406Plastic J significance in CTOD equation
https://imechanica.org/node/16223
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/77">opinion</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/32">fracture mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/668">j-integral</a></div><div class="field-item even"><a href="/taxonomy/term/1978">fracture toughness</a></div><div class="field-item odd"><a href="/taxonomy/term/7991">elastic plastic</a></div><div class="field-item even"><a href="/taxonomy/term/9602">ctod</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
<span>I am working on the validation of CTOD. </span>
</p>
<p>
<span>In the evaluation of CTOD using the<br />
J-integral approach as applied in ASTM E1290 and E1820, the plastic J<br />
component is defined as (Npl*Apl)/(Bn*Bo)<br />
Npl=dimensionless constant(plasticity)<br />
Apl=area under load vs. displacement plot<br />
Bn=ligamen length (W-a)<br />
Bo=section thickness</span></p>
<p>On E1820 there are different functions provided for Npl if Apl is<br />
evaluated differently (CMOD or load-line displacement).</p>
<p>Do anybody know what are the relation of the Npl to Apl and how they interact<br />
for the J-integral evaluation?
</p>
</div></div></div>Mon, 10 Mar 2014 14:14:25 +0000kobe2316223 at https://imechanica.orghttps://imechanica.org/node/16223#commentshttps://imechanica.org/crss/node/16223Error | iMechanica