Abstract The pure mode-I, pure mode-II and the mixed-mode I/II fracture behavior of the adhesively-bonded pultruded GFRP/steel joint were experimentally investigated by using double cantilever beam (DCB) test, and four-point end-notched flexure (4ENF) test combined with four-point single leg bending (4SLB) test, respectively. The extended global method (EGM) was employed to obtain closed-form analytical solutions of mode-II fracture toughness for the 4ENF specimen and mixed-mode I/II fracture toughness components for the 4SLB specimen. Combined with the mode-I fracture toughness obtained by the experimental compliance method (ECM), the power law criteria in initiation and propagation processes were developed for adhesively-bonded pultruded GFRP/steel joint. Validation on the developed mixed-mode fracture criteria was performed through employing it to predict the load-displacement responses of the 4SLB specimens combined with VCCT. Finally, the mixed-mode fracture criteria of the adhesively-bonded GFRP/steel joint were compared to those of the adhesively-bonded GFRP/GFRP joint for quantifying their difference.
Abstract The cohesive zone modelling (CZM) is extensively used for the simulation of delamination propagation of composite laminated materials. The Finite Element (FE) method is able to support the CZM. Nevertheless, a refined mesh in the cohesive zone is required to describe accurately the energy dissipation. A 1D-beam simplified analysis based on the macro-element (ME) technique has been developed for the stress analysis of bonded joints, supporting damage evolution adhesive material law. The ...
Abstract In this paper, the fracture properties of a structural adhesive are investigated via the Tapered Double Cantilever Beam (TDCB) and the Mixed Mode Bending (MMB) tests. The experiments were performed at low to fairly low loading rates. The results were analyzed using Linear Elastic Fracture Mechanics (LEFM). It is shown that the testing speed has considerable impact on the fracture behaviour when close to mode II. Nonetheless, TDCB and MMB Load-Unload tests revealed significant non-linear...
Last. Xiaoyuan He(SEU: Southeast University)H-Index: 22
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The bond–slip degradation relationship between carbon fiber-reinforced polymer and steel in a freeze–thaw environment is crucial to evaluate the long-term service performance of steel structures st...
Abstract The use of adhesive joints has increased rapidly in the past decades. Driven by the growing demand for lightweight structures, composite adherends have increased in popularity, benefiting from their high specific mechanical properties and design tailorability. However, composites are typically weak in the transverse direction, which can cause premature failure by delamination. Several techniques, aimed at reducing stress concentrations and increasing the transverse strength of the adher...
Abstract This paper reports an experimental study on the fatigue behavior of bonded interfaces between carbon fiber reinforced polymer (CFRP) plates and steel plates. A total of 20 single-shear bonded joints were tested under monotonic and fatigue loading. The digital image correlation (DIC) method was employed. The effects of the load ratio, adhesive thickness and adhesive type on the fatigue life were investigated. The failure mode, fatigue life, relative slip, load-slip curve, CFRP strain and...
#2Bing Zhang(UoB: University of Bristol)H-Index: 10
Last. Chuanzeng Zhang(Folkwang University of the Arts)H-Index: 4
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Abstract To successfully predict the delamination behaviour of the laminated composite structures with fibre bridging, the R-curve has to be studied. This work experimentally investigates the complete R-curve behaviour of the unidirectional and multidirectional carbon/epoxy composite laminates. The delamination tests use the double cantilever beam (DCB), mixed-mode bending (MMB) and end-notched flexure (ENF) specimens for mode I, mixed-mode I/II and mode II loading, respectively. The test result...
Abstract Steel structures using stainless steel are recently accepted as more sustainable and durable systems. Although much research has been conducted on steel structures strengthened by carbon fiber-reinforcement polymer (CFRP) material, these steel structures are often made of conventional mild steel and thus existing prediction and analysis specified for mild steel cannot be directly extended for that of stainless steel. Therefore, this study aims to develop a new prediction model for deter...
In the design of adhesive structures, it is extremely important to accurately predict their strength and fracture properties (critical strain energy release rate in tension, GIC, and shear, GIIC). In most cases, the loads occur in mixed-mode (tension plus shear). Thus, it is of great importance the perception of fracture in these conditions, namely of the strain energy release rates in tension, GI, and shear, GII, relative to different crack propagation criteria or fracture envelopes. This compa...
Abstract In aeronautics the weight of a structure is important and its strength is crucial. Composite structures are more and more used for their lightness and their high performance in fatigue solicitations. Nevertheless, metallic materials remain essential for some functions, which sometimes lead to the creation of hybrid structures, achievable with the use of bonding techniques. The bonding of metallic materials over composite, requires accurate knowledge of bonding properties in static and f...
Abstract null null Pultruded Fiber-Reinforced Polymers (FRP) are innovative structural elements that are experiencing a steady increase in use for different structural applications. Due to their appealing properties that set them apart from traditional construction materials, such as magnetic transparency and excellent strength-to-weight ratio, numerous experimental and numerical studies have been performed in the last decades to assess their performance as structural components. The description...
Abstract null null The bearing strength and failure behaviour of a new composite pre-tightened multi-tooth joint was studied experimentally and numerically. Four groups of different types of specimens were fabricated by varying key design variables including the pre-tightening force, tooth depth, tooth length, and number of teeth. Axial tensile tests were performed to determine the bearing capacity, failure modes, and load distribution law of the specimens. Furthermore, a three-dimensional conti...