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Engineering Materials and Structural Integrity

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Prof. Dr. Bing Yang

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State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu, 610031, China
Interests: fatigue and fracture of materials; fatigue cracking mechanism of additively manufactured parts

Special Issue Information

Dear Colleagues,

Engineering materials play an important role in both industry and construction, with lots of applications in fields like vehicles, aerospace, transport, marine, defense, civil engineering, etc. Meanwhile, engineering materials, components, and structures are usually subjected to variable loading and environmental conditions, such as static/dynamic loading, cyclic fatigue, overloading, vibrations, collision, creep, stress corrosion, crack propagation, etc. Research into the reliability and structural integrity of engineering materials is now receiving significant scholarly attention.

This Special Issue aims to demonstrate the latest reliability evaluation of materials’ properties and mechanical components, as well as engineering materials’ fabrication and testing technologies. We welcome contributions regarding engineering materials, structures, and mechanical components.

Potential topics include, but are not limited to, the following areas:

Engineering materials and structures, such as metals, steels, alloys, and composites;
Hybrid structures, like steel rails/bridges/axles, welding parts, connections, etc.;
Structural integrity and lifetime reliability, including deformation, wear, damage, fatigue, fracture, failure, shock-absorbing/resistance, etc.;
The fabrication, testing, and simulation technologies used in combination with engineering materials, including microstructural evolutions, stress–strain analysis, structural health monitoring (SHM), crack damage detection, non-destructive examination (NDE), the finite element method (FEM), etc.

Prof. Dr. Bing Yang
Guest Editor

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Research

12 pages, 5896 KiB

Open AccessArticle

Comparison of the Modified CTOD Measurement Method with the Double Clip Gauge Method in a Compact Tension Specimen

by Jeong Yeol Park, Myung Hyun Kim and Chang Wook Ji

Materials 2025, 18(2), 310; https://doi.org/10.3390/ma18020310 - 11 Jan 2025

Viewed by 795

Abstract

For allowable defect analyses, the fracture toughness of materials needs to be accurately predicted. In this regard, a lower fluctuation of fracture toughness can lead to reduction in safety and economic risks. Crack tip opening displacement (CTOD), which is the representative parameter for [...] Read more.

δ_{5}

, the J-conversion method, the single clip gauge method, and the double clip gauge method. When calculating CTOD from test results, the principle of similar triangles, which adopts the plastic hinge model, is influenced by the rotation factor,

r_{p}

. Therefore, in order to reduce the fluctuation of CTOD, the exact value of

r_{p}

must be defined. This study investigates various methods to predict fracture toughness in metallic materials, and assess the pros and cons of each method. Moreover, the equation of

r_{p}

is modified by using a double clip gauge in compact tension (CT) to reduce the fluctuation of CTOD. The

r_{p}

value is derived from 0.55 to 0.68, using the double clip gauge method. Finite element analysis is used to derive the

r_{p}

values, which range from 0.50 to 0.66, in order to verify the validity of the derived

r_{p}

values. This ensures the validity of the

r_{p}

value derived from the experiment. In addition, the fluctuation of CTOD, based on the modified equation of

r_{p}

, is lower than that using the single clip gauge method, according to BS 7448. Full article

(This article belongs to the Special Issue Engineering Materials and Structural Integrity)

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17 pages, 26738 KiB

Open AccessArticle

Fatigue Crack Growth Performance of Q370qENH Weathering Bridge Steel and Butt Welds

by Yujie Yu, Xiang Zhang, Chunjian Hu, Liangkun Liu and Haibo Wang

Materials 2024, 17(23), 6015; https://doi.org/10.3390/ma17236015 - 9 Dec 2024

Cited by 1 | Viewed by 859

Abstract

Weathering steel possesses good atmospheric corrosion resistance and is increasingly applied in highway and railway bridges. The fatigue performance of the weld joint is an important issue in bridge engineering. This study experimentally investigates the microstructural properties and fracture crack growth behaviors of a Q370qENH bridge weathering steel weld joint. The FCG parameters of the base steel, butt weld, and HAZs, considering the effect of different plate thicknesses and stress ratios, are analyzed. Microstructural features, microhardness, and fatigue fracture surfaces are carefully inspected. The FCG rates of different weld regions in the stable crack growth stage are obtained using integral formulas based on the Paris and Walker law. The test results indicate that the heating and cooling process during the welding of Q370qENH steel creates improved microstructures with refined grain sizes and fewer impurities, thus leading to improved FCG performances in the HAZ and weld regions. The crack growth rate of Q370qENH weld regions increases with the stress ratio, and the influencing extent increasingly ranks as the base steel, HAZ, and the weld. The thick plate has a slightly slower fatigue crack growth rate for the Q370qENH weld joints. The Q370qENH base steel presents the highest fatigue crack growth rate, followed by the heat-treated and HAZ cases, while the weld area exhibits the lowest FCG rate. The Paris law coefficients of different regions of Q370qENH welds are presented. The collected data serve as a valuable reference for future analyses of fatigue crack propagation problems of Q370qENH steel bridge joints. Full article

(This article belongs to the Special Issue Engineering Materials and Structural Integrity)

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