Fracture capacity of girth welded pipelines with 3D surface cracks subjected to biaxial loading conditions

2012 ◽  
Vol 92 ◽  
pp. 115-126 ◽  
Author(s):  
Yi Dake ◽  
Idapalapati Sridhar ◽  
Xiao Zhongmin ◽  
Shashi Bhushan Kumar
Keyword(s):  
Biaxial Loading ◽  
Surface Cracks ◽  
Loading Conditions ◽  
3D Surface

Fatigue Behavior of Adhesive Joints Under Biaxial Loading Conditions

1993 ◽  
Author(s):  
Erol Sancaktar
Keyword(s):  
Biaxial Loading ◽  
Fatigue Behavior ◽  
Epoxy Adhesive ◽  
Steel Beams ◽  
Loading Conditions ◽  
Adhesively Bonded Joints ◽  
Shear Loads ◽  
Bonded Joint ◽  
Solid Film ◽  
Static Shear

Abstract Fatigue data obtained under biaxial loading conditions for adhesively bonded joints are used to plot S-N type diagrams to assess the effects of biaxiality in loading. Independently Loaded Mixed-Mode Specimens (ILM MS) are used for data collection purposes. These specimens are basically two (steel) beams bonded to be fatigue loaded under cantilever (opening) mode while a simultaneous but physically separate in-plane (static) shear load is also induced with the aid of a small hydraulic piston embedded in the specimen. Application of such static shear loads results in different S-N behavior for the bonded joint. The model adhesives used are Metlbond 1113-2 and Metlbond 1113 solid film thermosetting adhesives similar to those commonly used in aircraft and aerospace industries. The former is an elastomer-modified epoxy adhesive and the latter is identical except that it containes a synthetic earner cloth. Thus, the effects of carrier cloth in adhesive’s S-N behavior is also assessed. Analytically, the classical linear log-log representation of the adhesive S-N data is explored and modifications necessary to reflect the effects of biaxiality in loading and also the presence of a carrier cloth are assessed. The fatigue failure results are also compared with results obtained under monotonic biaxial loading conditions.

NESC VII European Project: Demonstration of Warm Pre-Stressing Effect in Biaxial Loading Conditions: Bending Tests on 18MND5 Cruciform Specimens and Their Interpretation

2012 ◽  
Author(s):  
C. Jacquemoud ◽  
T. Yuritzinn ◽  
S. Marie ◽  
D. Moinereau ◽  
M. Nédélec ◽  
...  
Keyword(s):  
Cleavage Fracture ◽  
Biaxial Loading ◽  
Experimental Results ◽  
Experimental Program ◽  
Loading Conditions ◽  
Bending Tests ◽  
Loading Cycle ◽  
European Project

In the framework of the NESC VII European project, a large experimental program has been dedicated to characterize the Warm Pre-Stressing (WPS) effect in different testing configurations. One of the CEA (France) contributions to this project is the realization of five point bending tests on large cruciform specimens considering different WPS loading cycles. The five cruciform specimens, sponsored by EDF (France) and IRSN (France), are made of 18MND5 steel. Two of them have been tested on a same LCF (Load-Cool-Fracture) loading cycle and two others on the same LCTF (Load-Cool-Transient-Fracture) loading cycle. The experimental results presented in this paper give a successful demonstration of the WPS effect in biaxial loading conditions either on a LCF or on a LCTF cycle. During the test interpretations, different models have then been tested and compared in order to evaluate their ability to predict the cleavage fracture in the case of different WPS loading cycles. They all provide very conservative predictions whatever loading cycle is concerned.

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