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Mechanical Properties and Manufacturing Processes of FRP Composite Materials

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Dear Colleagues,

In recent decades, fiber-reinforced polymer (FRP) composites have been increasingly adopted in the field of engineering to achieve a reduced weight, a prolonged service life, or improved structural performance. Applications of FRP composites mainly lie in their advantages of high strength- and stiffness-to-weight ratios, superior corrosion resistance, excellent fatigue performance, etc. FRP composites can be manufactured through various techniques depending on the desired mechanical properties and geometries, and the most common techniques include pultrusion, filament winding, vacuum-assisted resin transfer molding, compression molding, wet lay-up, etc.

This Special Issue is seeking research on the mechanical properties and manufacturing techniques of FRP composites. To align with the scope of the journal, only research on materials for engineering is welcome.

Dr. Tian-Qiao Liu
Dr. Alexander Safonov
Dr. Daniel Carlos Taissum Cardoso
Guest Editors

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Keywords

FRP composites
mechanical properties
manufacturing techniques
experimental characterizations
finite element modeling
mechanics of FRP composites

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19 pages, 21188 KiB

Open AccessArticle

Study on CFRP-Strengthened Welded Steel Plates with Inclined Welds Considering Welding Residual Stress

by Xinyu Ding, Xu Liang, Man-Tai Chen and Lili Hu

Materials 2024, 17(8), 1804; https://doi.org/10.3390/ma17081804 - 14 Apr 2024

Viewed by 494

Abstract

Welded steel plates are widely used in various structural applications, and the presence of inclined welds is often encountered in practical scenarios. Carbon fiber reinforced polymer (CFRP) has been proven to be effective for strengthening steel structures. However, the behavior of CFRP-strengthened welded steel plates with inclined welds, particularly considering the influence of welding residual stress, is limited. This paper aims to investigate the tensile behavior of CFRP-strengthened welded Q355 steel plates with inclined welds considering welding residual stress (WRS). First, WRS data were obtained by the X-ray diffraction (XRD) method at different locations. The maximum tensile and compressive residual stresses are 0.39 and 0.14 times the yield strength of the steel, respectively. Then, finite element models were established to investigate the effects of weld angles, weld width, and height on the WRS distribution of welded steel plates. Finally, the tensile performance of CFRP-strengthened welded plates with WRS was studied by numerical simulation. The results showed that the weld angles have little effect on the distribution pattern of residual stress but significantly affect the peak tensile WRS. When the weld angle changes from 0° to 60°, the peak tensile WRS decreases significantly from 0.32 to 0.06 times the yield strength of steel; furthermore, the influence of weld width and height on WRS is relatively limited. Under tension loading, the maximum stress occurs near the weld. The ends of the weld enter the yielding state later than the middle part of the weld due to the distribution of the WRS. As the weld angle increases and the length of the weld increases, the stress in the weld zone decreases, while the stress in the base material zone correspondingly increases. In addition, CFRP strengthening can reduce the magnitude of stress. This study provides preliminary references for understanding the tensile behavior of CFRP-strengthened welded steel plates with inclined welds. Full article

(This article belongs to the Special Issue Mechanical Properties and Manufacturing Processes of FRP Composite Materials)

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17 pages, 8248 KiB

Open AccessArticle

Experimental and Numerical Investigation of the Mechanical Properties of a CFRP Tendon–Wedge Assembly Loaded under Transverse Compressive Loading

by Qinghua Han, Xiwen Zheng and Lichen Wang

Materials 2023, 16(9), 3305; https://doi.org/10.3390/ma16093305 - 23 Apr 2023

Viewed by 1094

Abstract

Carbon-fiber-reinforced polymer (CFRP) tendons have become a viable alternative to steel cables in cable roof structures owing to their high tensile strength, low weight, and resistance to corrosion. However, the effective anchoring of CFRP tendons is a challenge because of their poor transverse mechanical properties. Therefore, the mechanical properties of CFRP tendons and a tendon–wedge assembly under transverse compression were investigated by simulating the force environment of the CFRP tendon inside an integrated-wedge anchorage. The deformation of and local damage to CFRP tendons under transverse compression were explored using load–strain curves and full-field strain measured using digital image correlation. The experimental and numerical results show that large-diameter CFRP tendons with a length in the range of 90–110 mm had better cross-sectional deformation resistance and more stable transverse mechanical properties. Longer CFRP tendons with larger diameters have lower contact compressive stress and local maximal shear stress under the same transverse compressive load. Based on the analysis of the experimental and numerical results, we propose design suggestions for tendon size selection and integrated-wedge design details, such as the manufacturing materials of the wedge, the radius through the gap of the wedge, and the radial difference of the groove, to improve the anchoring properties and efficiency of the integrated-wedge anchorage. Full article

(This article belongs to the Special Issue Mechanical Properties and Manufacturing Processes of FRP Composite Materials)

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