Ultimate Strength and Failure Mode of Spot Welds in High Strength Steels

1977 ◽  
Author(s):  
D. J. Vandenbossche
Keyword(s):  
Ultimate Strength ◽  
Failure Mode ◽  
High Strength Steels ◽  
High Strength ◽  
Spot Welds

Ultimate Load Capacity of Spot Welds Made of Ultra High Strength Steels

2011 ◽  
Author(s):  
Zongfen Zhang ◽  
Chris Chen ◽  
Gregory Zywicki ◽  
Brad Blaski ◽  
James Blenman
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
High Strength Steels ◽  
High Strength ◽  
Spot Welds ◽  
Ultimate Load Capacity ◽  
Ultra High Strength Steels

scholarly journals Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Metals ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 111 ◽  
Author(s):  
Thibaut Huin ◽  
Sylvain Dancette ◽  
Damien Fabrègue ◽  
Thomas Dupuy
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Spot Welds ◽  
Advanced High Strength Steels

scholarly journals Mechanical properties and corrosion resistance of normal strength and high strength steels in chloride solution

2011 ◽  
Vol 7 (2) ◽  
pp. 94-100 ◽  
Author(s):  
Ahmad Rahbar Ranji ◽  
Amir Hamed Zakeri
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Corrosion Resistance ◽  
Ultimate Strength ◽  
Chloride Solution ◽  
High Strength Steels ◽  
High Strength ◽  
Carbon Steels ◽  
Tension Test ◽  
Normal Strength

The corrosion resistance (weight loss) and mechanical properties (i.e. yield strength, ultimate strength and elongation) for three carbon steels, normal strength and high strength steels using tension test are investigated. The specimens are kept in chloride solution (20% NaCl) up to 240 hours. At every 48 hours, thickness and weight loss is measured and tension test is carried out. It was found that the susceptibility of the steels to corrosion based on their weight loss were identical prior to 144 hours, after that is accelerated for high strength steel. In addition, it was found that manganese (Mn) has reduced corrosion rate at early stage of corrosion. The change in mechanical properties by corrosion for all steels are the same, and ultimate strength is reduced, which for limit state design of aged structure should be taken into account.DOI: 10.3329/jname.v7i2.5309

scholarly journals HAZ Microstructures and Local Mechanical Properties of High Strength Steels Resistance Spot Welds

2011 ◽  
Vol 51 (1) ◽  
pp. 99-107 ◽  
Author(s):  
Sylvain Dancette ◽  
Veronique Massardier-Jourdan ◽  
Damien Fabrègue ◽  
Jacques Merlin ◽  
Thomas Dupuy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength Steels ◽  
High Strength ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds

scholarly journals Spot Weld Strength Determination Using the Wedge Test: In Situ Observations and Coupled Simulations

2010 ◽  
Vol 24-25 ◽  
pp. 299-304 ◽  
Author(s):  
Rémi Lacroix ◽  
Joël Monatte ◽  
Arnaud Lens ◽  
Guillaume Kermouche ◽  
J.M. Bergheau ◽  
...  
Keyword(s):  
Energy Analysis ◽  
High Strength Steels ◽  
High Strength ◽  
Spot Weld ◽  
Weld Strength ◽  
Spot Welds ◽  
Local Loading ◽  
Advanced High Strength Steels ◽  
Strength Determination

This paper describes an innovative way to characterize the strength of spot welds. A wedge test has been developed to generate interfacial failures in weldments and observe in-situ the crack propagation. An energy analysis quantifies the spot weld crack resistance. Finite Element calculations investigate the stresses and strains along the crack front. A comparison of the local loading state with experimentally observed crack fronts provides the necessary data for a failure criterion in spot weld fusion zones. The method is applied to spot welds of Advanced High Strength steels.

scholarly journals Experimental investigation of two-bolt connections for high strength steel members

2018 ◽  
Author(s):  
Yan-Bo Wang ◽  
Yi-Fan Lyu ◽  
Guo-Qiang Li
Keyword(s):  
Failure Mode ◽  
Failure Modes ◽  
High Strength Steels ◽  
High Strength ◽  
Double Shear ◽  
Loading Direction ◽  
Steel Members ◽  
Edge Distance ◽  
End Distance ◽  
Bolt Spacing

This paper presents an experimental research on bearing-type bolted connections consisting of two bolts positioned perpendicular to the loading direction. A total of 24 connections in double shear fabricated from high strength steels with yield stresses of 677MPa and 825MPa are tested. Two failure modes as tearout failure and splitting failure are observed in experiments. The effect of end distance, edge distance, bolt spacing and steel grade on the failure mode and bearing behavior are discussed. For connection design with bolts positioned perpendicular to loading direction, it is further found that combination of edge distance and bolt spacing effectively determines the failure mode and ultimate load. The test results are compared with Eurocode3. An optimal combination of edge distance and bolt spacing as well as related design suggestion is thus recommended. 

Investigations on the Mechanical Behavior of Advanced High Strength Steels Resistance Spot Welds in Cross Tension and Tensile Shear

2010 ◽  
Vol 89-91 ◽  
pp. 130-135 ◽  
Author(s):  
Sylvain Dancette ◽  
Véronique Massardier-Jourdan ◽  
Jacques Merlin ◽  
Damien Fabrègue ◽  
Thomas Dupuy
Keyword(s):  
Three Dimensional ◽  
High Strength Steels ◽  
Complex Loading ◽  
High Strength ◽  
Weld Strength ◽  
Tensile Shear ◽  
Spot Welds ◽  
Advanced High Strength Steels ◽  
Cross Tension ◽  
Failure Types

Advanced High Strength Steels (AHSS) are key materials in the conception of car body structures, permitting to reduce their weight while increasing their behavior in crash conditions. Nevertheless, the weldability of AHSS presents some particular aspects, in that complex failure types involving partial or full interfacial failure can be encountered more often than with conventional mild steels during destructive testing, despite high spot weld strength levels. This paper aims at characterizing the behavior of different AHSS spot welds under two quasi-static loading conditions, tensile shear and cross tension, often used in the automotive industry for the determination of their weldability. Interrupted cross tension and tensile shear tests were performed and spot welds failure was investigated with optical micrographs, SEM fractography and 3D-tomography in order to follow the three-dimensional crack paths due to the complex loading modes. A limited number of failure zones and damage mechanisms could be distinguished for all steel grades investigated. Moreover, numerical simulation of the tests was used to better understand the stress state in the weld and the influence of geometrical features such as weld size on the occurrence of the different failure types.

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