A5014582977- Mechanical Behavior of Composites
- Fatigue and fracture mechanics
- Fiber-reinforced polymer composites
- Numerical methods in engineering
- Mechanical stress and fatigue analysis
- High-Velocity Impact and Material Behavior
- Structural Behavior of Reinforced Concrete
- Ultrasonics and Acoustic Wave Propagation
- Optical measurement and interference techniques
- Composite Material Mechanics
- Material Properties and Processing
- Advanced ceramic materials synthesis
- Structural Analysis of Composite Materials
- Advanced MEMS and NEMS Technologies
- Textile materials and evaluations
- Natural Fiber Reinforced Composites
- Metal and Thin Film Mechanics
- Nanomaterials and Printing Technologies
- Structural Analysis and Optimization
- Soft Robotics and Applications
- Dental Radiography and Imaging
- Structural Health Monitoring Techniques
- Material Properties and Applications
- Prosthetics and Rehabilitation Robotics
- Adhesion, Friction, and Surface Interactions
Tampere University
2017-2024
Materials Science & Engineering
2021
Maa- ja Vesitekniikan Tuki Ry
2018
Aalto University
2013-2017
University of Eastern Finland
1991
The aim of this study was to compare the levels fluoride and mutans streptococci in plaque grown on glass ionomer (Ketac-Fil) composite (Silar) restorations vivo. From tunnels left under brackets bonded either with or composite, 14-day-old samples were collected 14, 28, 42 days after bonding. For mean counts 0.5 × 103, 6.7 8.8 103 CFU at first, second, third collection, respectively, whereas for corresponding values 32.1 14.6 120.6 CFU. concentrations 19,985, 5,788, 5,019 ppm collections...
Adhesively bonded joints are used in many applications which dynamically loaded. Thus, excellent fatigue properties of adhesives, especially under fracture mode II, required. The II testing adhesive is challenging, where the observation crack length complicated. Accordingly, compliance-based effective definitions avoiding direct have been instead. experimental monitoring method using digital image correlation (DIC) studied this work. DIC-based compared to defining length. developed useful...
Delamination analysis in advanced composites is required for the laminate design phase and also during operation of composite aerospace structures to estimate criticality flaws damage. The virtual crack closure technique (VCCT) cohesive zone modelling (CZM) have been applied delamination simulation as numerical tools modelling. VCCT CZM their unique advantages disadvantages per application. This study focuses on application a brittle hybrid tungsten–carbon-fibre reinforced (CFRP-W) pursues...
The microbond (MB) test is the most widely adopted micromechanical to characterize fibre matrix interfaces but typically lacks reliability and output for determining multi-parameter interface models. In current research, MB enhanced by incorporating Fibre Bragg Grating (FBG) sensors local strain monitoring. Strain-force data used analyse validate type paramter values of a cohesive zone modelling (CZM) basis in three-dimensional damage model. For prepared epoxy resin droplets, that are as...
This work aims to quantify the effect of a diamond-like carbon coating (DLC) treatment aramid fibres and reveal conversion fibre-level performance leap on macroscale mechanical behaviour. The DLC-based is applied directly reinforcement laminates are infused with an epoxy matrix. After characterisation coated surfaces, composite analysed via interlaminar shear testing, fatigue testing damage tolerance microbond tests, 3D finite element simulation using cohesive zone model interface. results...
The stretchability of electronic devices is typically obtained by tailoring the stretchable interconnects that link functional units together. durability against environmental conditions, such as deformation and chemicals, therefore important to take into account. Different approaches, including encapsulation, are commonly used improve endurance interconnects. In this paper, geometry encapsulation layer initially investigated using finite element analysis. Then, with a narrow-to-wide layout...
Deformability of interconnects and conductors as the skeleton soft electronic devices plays an important role in stretchability whole system. To make stretchable, either employing deformable materials or tailoring design are primary approaches. It is also possible to combine two strategies. In advanced stretchable circuits, there a frequent need for transform from narrow wide geometry. Therefore, this paper assesses three different geometries that accommodate narrow-to-wide transition along...
The aging effects on composite stiffness are important when structures monitored under long-term mechanical loads and harsh chemical environment. This work aims to reveal the role of fibre-to-matrix interfacial elastic constants due a sulfuric acid immersion at high temperature pressure. glass fibre matrix interfaces rather impossible measure directly they cannot be easily subtracted from macro scale test results. Here, extensive numerical simulations automatically run show sensitivity all...
Damages in composite structures are typically repaired using external bonded patches. In this work, the damage tolerance within patches is studied double strap joint (DSJ) with carbon fibre reinforced plastic (CFRP) specimens. The work refers to bond-line manufacturing-related defects such as debond or dry area. Both intact and pre-cracked DSJ specimens numerically analysed experiments for comparisons. specimens' adherends were CFRP laminates AS4/3501–6 plies adhesive film FM 300–2....
Abstract The accurate determination of interfacial strength in composites poses a significant challenge, critical factor yet often complex due to the multitude unknowns that affect microbond (MB) test. This complexity arises not only from different individual parameters, but also combined effects these parameters interdepending with each other. study presents thorough analysis MB test, carried out through numerous finite element simulations take into account wide range parameters. was...
Film adhesives are a form of composite consisting two constituents i.e. fibrous carrier and matrix. The fracture surfaces usually dominated by the carrier-matrix de-bonding, but it also co-exists with minor failure related to resin closer adhesive–adherend interface. This investigation aims at realistic representation modes. For this, 3D multi-layer approach FM 300-2 adhesive is defined where non-local Continuum Damage Model (CDM) developed accounting for proper matrix mechanism lower...
Abstract A comparison of the modelling methodologies to capture damage onset and delamination initiation in Abaqus LS-Dyna is presented. quasi-isotropic carbon fibre reinforced polymer laminate modelled under a low-energy impact scenario. Hashin, Puck Cuntze criteria are implemented for assessing intra-laminar linear elastic regime without evolution, with Virtual Crack Closure Technique being used inter-laminar failure. In LS-Dyna, Chang-Chang criterion intra-lamina failure whereas captured...
This work presents a detailed analysis of failure prediction for glass fiber reinforced plastic (GFRP) composite under out-of-plane compression at quasi-static (10−3 and 1 s−1) high strain rates (103 s−1). The simulations were compared with the experiments recent study (Pournoori. et al. Int. J. Impact Eng., 147 (2021)). different was predicted using three-dimensional (3D) Hashin criterion implemented into finite element by Abaqus user-defined subroutines UMAT VUMAT. According to results,...