Mixed-mode Fracture Analysis of a Structural Adhesive by Contour Integral Concepts| Chapter 4 | Techniques and Innovation in Engineering Research Vol. 7

 Adhesive joint strength prediction mostly relies on the Finite Element Method (FEM), with preponderance to the cohesive zone modelling (CZM) approach due to excellent predictive capabilities. This work aims to validate the application of FEM-CZM to the analysis of single-leg bending (SLB) adhesive joints. Thus, the geometries used for experimental testing were reproduced numerically and experimentally obtained properties were employed in these models. Upon the validation of the numerical technique, a parametric study involving the cohesive laws’ parameters is performed aiming to evaluate their influence on the overall behaviour of this type of adhesive joint. As a result of this work, it was possible to numerically model SLB tests of adhesive joints and estimate the mixed-mode behaviour of a structural adhesive, which enables mixed-mode modelling and design of adhesive structures.

Author(s) Details:

L. F. R. Neves,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal.

R. D. S. G. Campilho,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal.

I. J. Sanchez-Arce,
INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.

Please see the link here: https://stm.bookpi.org/TAIER-V7/article/view/9119

Evaluation of a Novel Structural Adhesive for the Automotive Industry| Chapter 1 | Techniques and Innovation in Engineering Research and Technology Vol. 5

 High performance fundamental adhesive are now being used often in the car subdivision to decrease bus weight and enhance the crash fighting of automotive buildings. The souped up adhesives secondhand in the car subdivision must able to have or do endure weighty active loads apart from bearing extreme mechanical substance so that meet these necessities.   Because of their difficult behaviour, the design process required to generate constructions accompanying these fabrics necessitates a all-encompassing understanding of their machinelike features. In this work, the machinelike features of a structural gluing, Sikapower® 4720, were persistent. Tensile tests were acted to decide the Young’s modulus (E) and tensile strength (σf). Shear tests were acted to decide the clip modulus (G) and the cut strength (Tf). Tests were still completed activity to decide the sticking's toughness. For manner I determination perseverance (GIc), the Double-Cantilever Beam (DCB) test was working. For decision of toughness under way II (GIIc), completely-Notched Flexure (ENF) test was acted. The test verdicts were able to wholly automatically delimit the sticking and show that it not only has strong machinelike substance but too a large size of ductility.

Author(s) Details:

J. P. R. Monteiro,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal.

R. D. S. G. Campilho,
Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial (INEGI), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.

Please see the link here: https://stm.bookpi.org/TAIERT-V5/article/view/9052

A Comprehensive Experimental Study on Bi-Adhesive Technique Applied to Structural T-Joints | Chapter 3 | Techniques and Innovation in Engineering Research Vol. 1

 T-joints are employed in a variety of industries, including the automotive, marine, and aerospace sectors. The bi-adhesive technique, which uses two adhesives and places a harder adhesive in the centre and a more flexible one at the overlap ends, is examined in this paper. The effectiveness of this approach in T-joints was tested using various adhesive ratios. A numerical research was conducted utilising the CZM technique in the ABAQUS® software to assess this idea. It included an examination of failure modes, stresses, strength or maximum load (Pm), and dissipated energy (U). Using the current work, the CZM approach was originally confirmed through experimental findings. The numerical work that followed showed that it is possible to raise Pm and U in comparison to single-adhesive joints and that the strength of T-joints is strongly dependant on the adhesive mixture utilised.

Author(s) Details:

P. M. D. Carvalho,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal.

R. D. S. G. Campilho,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal and INEGI – Pólo FEUP, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal.

I. J. Sánchez-Arce,
INEGI – Pólo FEUP, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal.

R. J. B. Rocha,
INEGI – Pólo FEUP, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal.

A. R. F. Soares,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal.

Please see the link here: https://stm.bookpi.org/TAIER-V1/article/view/8174

Mechanical and Fracture Property Estimation of a Structural Adhesive | Chapter 2 | Techniques and Innovation in Engineering Research Vol. 1

 When using advanced fracture mechanics-based techniques, such as cohesive zone models, it is not enough to understand the conventional mechanical properties, such as Young's modulus (E), shear modulus (G), tensile strength (f), and shear strength (f), to predict crack propagation of an adhesive joint (CZM). Actually, it's also important to estimate the tensile and shear fracture energies (GIIC). A new structural two-component epoxy adhesive's mechanical and fracture properties are being characterised in this work. Four tests were carried out for this purpose: end-notched flexure, double-cantilever beam, thick adherend shear tests, and tensile testing to bulk specimens (ENF). The test outcomes supported the manufacturer's data and allowed for the construction of bonded structures with this glue.

Author(s) Details:

J. E. C. Pinto,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal.

R. D. S. G. Campilho,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal and INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.

Please see the link here: https://stm.bookpi.org/TAIER-V1/article/view/8173

Tensile Cohesive Laws of Adhesive Joints as a Function of the Adhesive Thickness | Chapter 14 | Technological Innovation in Engineering Research Vol. 3

Because bonded structures bear such a high level of responsibility, it is critical to accurately predict fracture behaviour under a variety of stresses. Numerical simulations, similar to Cohesive Zone Models (CZM), can be used for strength prediction. The influence of adhesive thickness (t_A) variation on the value of tensile fracture toughness (G_n^c) of a bonded joint is investigated numerically in this paper. The direct technique was also used to get the cohesive qualities and geometric dimensions that were incorporated as basic properties in the simulation software. The numerical effort entails reproducing the experimental data, namely the load-displacement (P-d) curves, in order to confirm the cohesive laws established for the various tested t_A. For this project, the triangular CZM was chosen, with 2D modelling in plane-strain conditions as the most suited condition for the geometry in issue. CZM guidelines for the Sikaforce® have been provided and proven as a consequence of this study for the design of bonded structures, substantially speeding up the procedure.

Author(s) Details:

R. P. R. O. Antunes,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal.

R. D. S. G. Campilho,
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal and INEGI – Pólo FEUP, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.

Please see the link here: https://stm.bookpi.org/TIER-V3/article/view/7072

Investigating the Effect of Reinforcement Bridging on the Elastic Fracture Energy of Concrete | Chapter 13 | Recent Trends in Chemical and Material Sciences Vol. 1

 Structure failure can be investigated using either a strength criterion or a fracture mechanics criterion. Beyond crucial criteria like yield and ultimate strength, the strength criterion deals with material resistance. Toughness, which can be characterised as stress intensity factor (K) or fracture energy, is used to identify the critical condition in fracture mechanics (G). Based on linear elastic fracture mechanics – LEFM – this study investigates the critical point during loading up to the limit of elasticity. Nonlinearity, on the other hand, is typically caused by the presence of a relatively wide fracture process zone – FPZ – at the crack-tip. As a result, the use of LEFM in quasi-brittle materials like concrete is restricted to big buildings. The size effect law – SEL is a well-known method for calculating the fracture energy G f for infinite big structures. The specific energy, or energy per unit crack plane area, is specified as G f. This is a linear form of elastic energy. The goal of this research is to find an answer to one question: Does reinforcement work just during composite activity between reinforcement and concrete, or does it work before that? Using the RILEM Specification Test Method, a study was done using the work-of-fracture – WOR principles. Normal concrete three-point-bend beam specimens were exposed to monotonic load P until they failed. The genuine work takes precedence over the P–u relationship. By dividing the area under the P–u curve of the elastic range with ligament, the elastic fracture energy based on WOR, G (F-el)R, was discovered. G (F-el)R = 397.87 N/m for beam A1 (bending failure, l/h=5.5), and 133.6 N/m for beam B1 (shear failure, l/h=5.0). Beam B2 shear failure, l/h=5.0, 101.93 N/m; beam B3 shear failure, l/h=5.0, 153.75 N/m. G (F-el)R is higher than G f, indicating that reinforcement has a role in enhancing elastic fracture energy as well as plastic fracture energy.

Author (s) Details

A. H. Patty
Civil Department, Widya Karya Catholic University, Jl. Bondowoso 2 - Malang, 65115, Indonesia.

View Book :- https://stm.bookpi.org/RTCAMS-V1/article/view/2190

Model of Fracture, Friction and Wear Processes of Heterogeneous Iron | Chapter 1 | Current Approaches in Science and Technology Research Vol. 1

 Pore volume, fracture character, contaminants, alloying, concentration inhomogeneity, friction conditions, and other factors all have an impact on the mechanical and tribotechnical properties of powdered materials. Pores also have an impact on the speed of diffusion processes and the reduction of undercooled austenite.anti-resistance To explore porous iron characteristics, ultrapure iron that has been annealed in hydrogen was employed. a powder Porosity has a nonmonotonic effect on toughness fracture and tribotechnical characteristics.Unlike all other known dependencies derived from technical iron powders. The results of research have been revealed. The fact that the average dimension of porous changes during the process of porosity reduction by pressing and annealing cycles. Models of friction, wear, and fracture of pure porous iron were produced based on the examination of porous structure.

Author (s) Details

Dr. A. A. Shatsov
Mechanical Technological Faculty, State National Research Politechnical University of Perm, 29 Komsomolskii Avenue, Perm 614990, Russia.

View Book :- https://stm.bookpi.org/CASTR-V1/article/view/1333