Abstract Since fatigue investigations are expensive and time consuming, models capable of predicting lifetime by leveraging existing experimental data desirable. Here, this task is accomplished combining machine learning (ML) finite element analysis (FEA). The dataset contains 365 points comprising four adhesives with different joint types. model fed input parameters: stress ratio amplitude (functions the applied load), concentration factor multiaxiality, which obtained from FEA. An...

Toughened epoxy adhesives are widely used for structural applications, especially in the design of lightweight products. During their service life, bonded joints exposed to cyclic loading under a broad range temperatures. In this study influence temperature on fatigue behaviour toughened adhesive was investigated by experimental determination SN curves tension–tension loading. Bulk specimens and single lap, thick adherend scarf were tested at stress ratio R = 0.1 frequency f 7 Hz five...

Blending of biodegradable polymers in combination with low-price organic fillers has proven to be a suitable approach produce cost-effective composites order address pollution issues and develop products superior mechanical properties. In the present research work PBAT/PHB/Babassu 25, 50, 75% each polymer 20% Babassu were produced by melting extrusion. Their thermal, mechanical, morphological behavior was investigated differential scanning calorimetry (DSC), tensile testing, electron...

Here, a comparative investigation of data-driven, physics-based, and hybrid models for the fatigue lifetime prediction structural adhesive joints in terms complexity implementation, sensitivity to data size, accuracy is presented. Four data-driven (DDM) are constructed using extremely randomized trees (ERT), eXtreme gradient boosting (XGB), LightGBM (LGBM) histogram-based (HGB). The physics-based model (PBM) relies on Findley’s critical plane approach. Two (HM) were developed by combining...

Due to their improved recyclability, thermoplastic composites (TPCs) are increasing application across industries. The current work deals with the dimensioning, manufacturing, and characterisation of vacuum-infused TPCs cured at RT made non-crimp glass fabric liquid acrylic-based resin Elium©. Laminates 10 12 layers achieved a fibre weight content 73% measured by burn-off process, which corresponds volume 55%. Three-point bending tests revealed strength 636.17 ± 25.70 MPa modulus 24,600 400...

ABSTRACT Four adhesively bonded composite patch repairs are considered: with one and two double CFRP layers scarf ratios of 1:15 1:30. Prepregs applied to an artificially cracked aluminum plate using a film adhesive. Considering curing‐induced deflection patches, samples ratio exhibit the highest deflection, while layer 1:30 shows lowest deflection. FE simulations align experimental results showing deviations between −3% +16%. Fatigue crack length as function cycles reveal that patched have...

Elephant grass is an outstanding crop biomass for sustainable energy generation. Here, the effect of plant parts (stem, leaf, and whole plant) at four ages (90, 120, 150, 180 days) on proximate, chemical, elemental characteristics elephant cultivar BRS Capiaçu investigated. From proximate analysis, heating value dependent water content regardless part age. A linear model allowing prediction solely based derived from measurements. Density modelled as a quadratic function across parts. Such...

The objective of this study was to produce and evaluate briquettes from residues corn crops its association with cotton crop residues, rice husk or elephant grass for energetic use. Data on moisture, immediate chemical analysis, bulk density, higher calorific value (HCV), volumetric expansion mechanical strength were used compare the treatments. Biomass densified at 125ºC under 15 MPa pressure 8 minutes. HCV results similar all analysis showed high VC FCC highest AC observed in briquets 20%...

Bisphenol F and aniline-based benzoxazine monomers were selected to fabricate basalt, glass carbon fiber reinforced polybenzoxazine via vacuum infusion, respectively. The impacts of the type reinforcement on resulting material properties polymers (FRPs) studied. FRPs exhibited a homogenous morphology with completely impregnated fibers near-zero porosity. Carbon showed highest specific mechanical because its low density high modulus strength. However, regarding flammability, fire, smoke...

The use of adhesive bonding for designing lightweight load-bearing components has increased in recent decades. In this paper the influence plasticity on lifetime prediction bonded joints using stress-life approach was investigated. a toughened epoxy structural applications. Stress calculations were performed finite element analysis. Three material models employed, linear-elastic model and two elastoplastic models: Von Mises (pressure independent) Drucker–Prager dependent). Effective stress...

The fatigue lifetime of joints bonded with a toughened epoxy adhesive has been estimated using the stress-life method, based on experimental SN curves. Five temperatures (35°C, −10°C, RT, +50°C, +80°C) were considered. estimations performed direct approach, for having near-homogeneous stress distributions (scarf joints), and; an optimised inhomogeneous (single lap joints). calculated considering linear-elastic material behaviour analytical methods and finite element analysis. For effective...

The work investigates failure criteria and mean stress correction approaches for the fatigue lifetime prediction of two hyperelastic adhesives (a polyurethane, PU, a silicon-modified polymer, SMP). Fatigue experiments are carried under constant amplitude cyclic loading at RT 40°C/60% r.h with butt- thick-adherend-shear-test-joints three ratios R = −1, 0.1 0.5. Three evaluated: Goodman (static strength based), Schütz (mean sensitivity based) Kujawski & Ellyin (parameter optimisation based)....

Abstract Fatigue failure criteria for structural film adhesive joints considering multiaxiality, mean stress and temperature effects were investigated. Multiaxiality was addressed by testing butt, scarf thick adherend shear test joints. Mean effect evaluated under ratios of −1.0 0.1, the assessed at −55°C, RT +100°C. results using three fatigue criteria: (1) maximum principal stress, (2) linear Drucker‐Prager or (3) Findley's critical plane. All worked well on fitting multiaxial behaviour...

This work presents an approach for lifetime calculation of adhesively bonded joints under proportional and non-proportional multiaxial fatigue loads. In-phase out-of-phase data with varying stress ratio (R = 0.1 −1.0) from several joint geometries (butt, scarf, thick adherend shear test butt-bonded double pipe joints) was employed. The is based on the stress-life concept Theory Critical Distances (TCD) considering point line methods. Stresses were calculated using 2D-FEA linear-elastic...

Following the vision of European Commission, organisations and workers establishing Industry 5.0 approaches aspire to more future-proof, resilient, sustainable, human-centred industries. In this contribution, we explore how technological innovations that contribute a “win–win” interaction with involved stakeholders may be advanced in transparent proceeding supported by impartial expert translators who provide information or knowledge-based guidance for decision-makers, initiators...

Polyurethane (PU) is a very versatile material in engineering applications, whose mechanical properties can be tailored by the introduction of active fillers. The current research aims to (i) investigate effect fillers with varying filler loads on PU system and (ii) develop micro-mechanical model describe hyperelastic behavior (un)filled PU. Three models are taken into consideration: without strain amplification, constant deformation-dependent amplification. measured uniaxial stress–strain...

A comparative investigation between an invariant-based approach using the signed Beltrami-stress and critical-plane Findley-stress is carried out for fatigue lifetime prediction of epoxy structural adhesive under multiaxial non-proportional loading with varying mean stress. Fatigue experiments uniaxial (proportional non-proportional) are done at stress ratios −1 0.1. Two joints evaluated: a hollow-cylinder butt-joint (HCBJ, sample homogeneous stresses distribution), flange-rod-joint (FRJ,...

Liquid organic hydrogen carriers (LOHCs) are a key technology for decarbonized industrial production. A comparative study on the material selection of tanks storage and transport LOHC is presented. Three classes compared: metals (steel), polymers (thermoplastic), composites (glass fiber‐reinforced plastic). Considering existing standards, two sizes (150 700 m 3 ) dimensioned based scenario requirements loading environmental conditions specific to benzyltoluene. Thermoplastic fulfilling...