Stress analysis of a fracture test specimen for cementitious materials

1996 ◽  
Vol 18 (2) ◽  
pp. 141-151 ◽  
Author(s):  
B.B. Sabir ◽  
M. Asili
Keyword(s):  
Stress Analysis ◽  
Test Specimen ◽  
Cementitious Materials ◽  
Fracture Test

Numerical analysis of a new mixed mode I/III fracture test specimen

2015 ◽  
Vol 134 ◽  
pp. 95-110 ◽  
Author(s):  
M.R.M. Aliha ◽  
A. Bahmani ◽  
Sh. Akhondi
Keyword(s):  
Numerical Analysis ◽  
Test Specimen ◽  
Mixed Mode ◽  
Mode I ◽  
Fracture Test

Three-Dimensional Finite Element Analysis of a Mixed Mode I/II Fracture Test Specimen: Asymmetric Four-Point Shear Specimen

2017 ◽  
Author(s):  
Mark Cohen ◽  
Xin Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Test Specimen ◽  
Mixed Mode ◽  
Three Dimensional ◽  
Mode I ◽  
Fracture Test ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this paper, extensive three-dimensional finite element analysis is conducted to study the asymmetric four-point shear (AFPS) specimen: a widely used mixed mode I/II fracture test specimen. Complete solutions of fracture mechanics parameters KI, KII, KIII, T11, and T33 have been obtained for a wide range of a/W and t/W geometry combinations. It is demonstrated that the thickness of the specimen has a significant effect on the variation of fracture parameter values. Their effects on crack tip plastic zone are also investigated. The results presented here will be very useful for the toughness testing of materials under mixed-mode loading conditions.

Dynamic Cyclic Stress Analysis of Rolling of a Diametrically Loaded Helical Test Specimen

2017 ◽  
Author(s):  
Don Metzger ◽  
Mark Paulseth ◽  
Andre Gagnon
Keyword(s):  
Cyclic Loading ◽  
Stress Analysis ◽  
Test Specimen ◽  
Three Dimensional ◽  
Cyclic Stress ◽  
Fatigue Analysis ◽  
Rolling Motion ◽  
Structural Components ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In a particular nuclear application, separation between structural components is maintained by a helical spring such that the separating load bears across the diameter of the spring coils. Relative motion between the structural components due to changing load and temperature is accommodated by rolling of the spring. This rolling motion while under radial load results in cyclic loading of the spring material. Fatigue analysis of the cyclic loading must take into consideration the material degradation due to the unique operating environment, so testing of ex-service material is required. Standard fatigue test specimens are not possible due to the small dimensions of the spring component, so cyclic stress is applied to the material via a reciprocating rolling motion between two platens. Stress analysis of this arrangement provides the stress range and mean stress necessary for fatigue analysis. A three dimensional finite element dynamic simulation of the test process is applied to a nominal test specimen to determine detailed history of the stress distribution. Numerical challenges are addressed to ensure representative loading conditions are properly applied, and that steady-state response is achieved. Bounding stress ranges are determined, and the implications of the results in fatigue analysis are discussed. It is concluded that response at the ends of the specimens is important in properly evaluating test data.

scholarly journals An approximate solution of compact test specimen for mode I fracture test by variational approach: Applied to fibrous composite

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 7223-7233
Author(s):  
Yuling Bian ◽  
Baolu Sheng ◽  
Aiping Zhou
Keyword(s):  
Approximate Solution ◽  
Test Specimen ◽  
Fibrous Composite ◽  
Initial Crack ◽  
Standard Test ◽  
Fe Model ◽  
Fracture Test ◽  
Initial Crack Length ◽  
Calculation Results ◽  
Compact Test

The present work presented an approximate solution for a compact test (CT) specimen that was employed as a standard test provided by ASTM E399-19 (2019). The variational method was employed to obtain the solution. The method used a two-step strategy to approximate the displacement response of the CT specimen. The first step was to obtain the general form of displacement solution, and then, the Rayleigh-Ritz approach was employed to modify the solution of the first step. A compliance equation of the CT specimen was obtained, and furthermore, the formula to calculate the stress intensity factor was obtained. The solution was validated by finite element (FE) model and the formula specified in ASTM E399-19 (2019). It was concluded that the calculation results of the proposed solution agreed well with the results of the FE model prediction for the ratio of initial crack length-to-ligament length, which was in the range of 0.25 to 0.35. Furthermore, compared to the results predicted by using the formula addressed in ASTM E399-19 (2019), the method proposed in the present study can achieve closer results than that of the FE model.

Experimental Study of the Principal Stresses Separation Using a Combination of Photoelasticity and Thermoelastic Stress Analysis

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1427-1433 ◽  
Author(s):  
Akira Shimamoto ◽  
Hiroshi Ohkawara ◽  
Fumio Nogata ◽  
Sung Mo Yang
Keyword(s):  
Stress Concentration ◽  
Stress Analysis ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Test Specimen ◽  
Thermoelastic Stress ◽  
Thermoelastic Stress Analysis ◽  
Principal Stresses ◽  
Thermoelastic Stresses ◽  
The Difference

In this paper, we report the experimental results of the principal stresses separation using a combination stress analysis of photoelasticity and thermoelasticity. Experimental investigation was carried out on specimens made of epoxy resin with a center hole under constant tensile loads. In case of photoelasticity test, only the difference of the stress is obtained, and in case of thermoelastic stress analysis, only the sum of the stress is measured. However, it is difficult to separate principal stress by only either of them. Then, Mohr's stresses circle was employed as the most easy and convenient method to separate of principal stresses. Moreover, by using different shape of center hole at the specimens, the change of the stress concentration factor at the vicinity of center hole of the test specimen by data of photoelasticity and thermoelastic stress analysis was obtained. The effectiveness of the principal stresses separation from the photoelastic and thermoelastic stresses measured values was verified. We also confirmed the capacity of application of the thermoelastic stress analysis to evaluate stress concentration factor.

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