The influence of pre-straining on the high-cycle fatigue performance of two hot-dip galvanised car body steels

Berchem, K; Hocking, M. G.

doi:10.1016/j.matchar.2006.07.003

Cited by 33 publications

(19 citation statements)

References 19 publications

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“…These dislocations influence each other through their stress fields, which leads to mutual obstruction and therefore reduction of dislocation mobility. 9) Regarding the tensile properties after pre-deformation, the yield strength increased with a higher amount of pre-deformation and was greater than the fatigue limit after deformation. Therefore, it can be assumed that the increase in yield strength due to strain hardening was responsible for the improved fatigue performance of the pre-strained material.…”

Section: Fatigue Properties (1) High-cycle Fatigue Test Resultsmentioning

confidence: 95%

High-Cycle Fatigue Properties of Automobile Cold-Rolled Steel Sheet with Stress Variation

Jeong

2013

Mater. Trans.

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Since many components in the automotive body and chassis are produced by various manufacturing processes, have different chemical compositions, and are subjected to complex loading cycles, it is important to understand their loading mechanisms and susceptibility to damage. This research examined the mechanical properties of cold-rolled steel sheets and evaluated the effects of stress variations on fatigue behavior. Specifically, a series of load-controlled high-cycle fatigue tests were conducted by varying the stress levels of SPCC and SPRC340 sheet materials. The results showed that fatigue life and the fatigue limit increased with higher tensile and yield strengths. In addition, testing results indicated that the fatigue limit was higher than the monotonic yield strength due to cyclic hardening with plastic deformation during fatigue cycling. Regarding tensile properties upon pre-deformation, the yield strength increased with a higher amount of pre-deformation and was greater than the fatigue limit after deformation. Based on these experimental results, two types of fracture modes were observed under the applied stress range. General fatigue fracture mode, which denotes failure by crack initiation, propagation and final rupture at low stress amplitude, was observed with fatigue lives larger than 4 © 10 5 cycles. On the other hand, constrained fracture mode occurred at stress levels higher than 0.89 times the tensile strength and exhibited a fracture surface without fatigue crack initiation or propagation.

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Section: Fatigue Properties (1) High-cycle Fatigue Test Resultsmentioning

confidence: 95%

High-Cycle Fatigue Properties of Automobile Cold-Rolled Steel Sheet with Stress Variation

Jeong

2013

Mater. Trans.

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“…Due to the cathodic protection generated by the zinc this coating remains effective against corrosion even if spalling is caused by impact or rough handling and part of the base material is exposed. The influence of pre-straining on the fatigue resistance of hot dip galvanized steel has also been investigated [7]. In fact, the coating layer might influence the fatigue life of the joint causing early crack initiation.…”

Section: Introductionmentioning

confidence: 99%

“…Steel wires have been tested [5,6] with focus on the corrosion fatigue response of the material. The influence of pre-straining on the fatigue resistance of hot dip galvanized steel has also been investigated [7]. All these results regard un-notched non welded components.…”

Section: Introductionmentioning

confidence: 99%

Medium to high cycle fatigue investigation on hot dip galvanized structural steel welded joints

2019

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Hot dip galvanization offers stable and lasting corrosion protection to steel structure, both acting as a barrier for external agents and inducing galvanic protection, through the deposition of a thin layer of zinc on the steel structure by submersion in a molten bath of the metal. Current standards for welded steel structures subjected to fatigue loads do not allow the use of the technique, while the cost for maintenance, repair or failure due to corrosion has an elevated worldwide impact. A series of hot dip galvanized structural steel welded specimens was tested with the aim of increasing the understanding of the damage and failure of a structure that has undergone such treatment. The goal is to define whether the use of hot dip galvanization poses a threat to structural safety and if this is eventually accountable for with the use of a certain corrective coefficient for the fatigue classes reported in the regulations. A revision of old fatigue data is here reported to critically discuss the new results presented.

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“…A wide study on the effect of the coating on the fatigue strength of ferritic steels shaped in un-notched geometries and, performing fatigue predictions on a KitagawaTakahashi diagram's based tool, it was found that the zinc layer does not affect the fatigue life up to a thickness of 60 µ [9]. The influence of the coating on the fatigue life has been explored also for the cases of steel wires [10,11], different steel alloys with similar static characteristics [12]. All these results were obtained in the case of absence of geometrical stress intensifications, while fewer are present in the case of hot dip galvanized welded steel joints [13].…”

Section: Introductionmentioning

confidence: 99%

Local strain energy based fatigue assessment of cruciform welded joints: experimental data analysis and influence of hot-dip galvanization

et al. 2018

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Abstract. Performing the fatigue assessment of a welded joint using the Notch Stress Intensity Factors [1] presents two major challenges. The first is the necessity of a precise reconstruction of the stress field around the notch tip, thus needing an extremely refined discretization with an evident computational cost. The other, is that the dimensions of the N-SIFs and so their critical values, vary accordingly to the William's solution [2] depending on the notch-opening angle. Consequence of this is that the mechanical properties necessary for the assessment vary as a function of the geometry treated. The research to overcome this issue has led to the use of the local Strain Energy Density [3]. The power of this parameter, used as a tool to perform fatigue assessment, consists of having a very low mesh refinement sensitivity [4], being the energy computed directly from nodal displacements and stiffness matrix [5], and having constant dimensions, so constant critical value for a given class of materials. In this paper, the local energetic method is applied to the analysis of the results of a series of tests performed on cruciform load carrying and non-load carrying specimens realized by S235 JRG2 structural steel plates. If load carrying, the fillet welded joints are made of S355 J2+N structural steel. The fatigue testing has been performed in atmosphere at room temperature in as welded condition both with and without the corrosion protective zinc layer. Particularly, the interest is focused on the influence of the zinc layer of the fatigue properties of the joint and on the capability of the local energetic approach, confronted with the classic nominal stress approach, to accurately predict the fatigue failure. To conclude, the investigation of the tests executed reveals no significant difference in the fatigue life for the coated samples, compared with the uncoated specimens and the predictions according to the IIW recommendations [6].

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The influence of pre-straining on the high-cycle fatigue performance of two hot-dip galvanised car body steels

Cited by 33 publications

References 19 publications

High-Cycle Fatigue Properties of Automobile Cold-Rolled Steel Sheet with Stress Variation

High-Cycle Fatigue Properties of Automobile Cold-Rolled Steel Sheet with Stress Variation

Medium to high cycle fatigue investigation on hot dip galvanized structural steel welded joints

Local strain energy based fatigue assessment of cruciform welded joints: experimental data analysis and influence of hot-dip galvanization

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