This article presents the development of an experimental methodology based on acoustic emission wave detection for determining delamination onset and propagation in carbon fibre composite materials under quasi-static fatigue loading. Delamination was investigated interlaminar fracture testing over a wide range mixed-mode ratios ( G II / T = 0, 0.3, 0.5 1) unidirectional woven samples. An method developed to detect onset, corresponding toughness computed. Interlaminar also calculated by beam...

The present study focuses on the synthesis and structural analysis of poly-ε-caproamide (PA6), produced through anionic polymerization ε-caprolactam in bulk, utilizing mono bifunctional activators. research investigates the...

Abstract Non‐Fickian or anomalous diffusion is frequently observed when the absorption of moisture by a polymer being studied. Different models have been presented in literature that can accurately predict trends weight‐gain curves. However, it not always clear which these yield good predictions distribution. This article presents time‐resolved distribution study an epoxy sample immersed deuterated water (D 2 O) at 70°C over period 2.5 months. The was measured during with novel...

Abstract The behavior of cured FM300 epoxy, a structural film adhesive, subjected to partial and full moisture saturation has been evaluated. Three separate but interrelated test methods were used: stress relaxation, fracture toughness, dynamic mechanical testing. response the epoxy due increasing content was dependent on testing method. In relaxation testing, plasticized when partially saturated with moisture, it became more rigid fully saturated. plasticization‐to‐stiffening transition not...

An investigation into high flow compression molding for recycling thermoplastic discontinuous long fiber composites is presented. High recycled panels and conventional low baseline were produced with a large rectangular (2:1 aspect ratio) mold. Flow was induced in the by stacking cut sections of conventionally center mold cavity, representing 25% initial coverage. molded found to exhibit significantly higher than tensile strength (+50%) modulus (+31%) when tested direction parallel flow....

Discontinuous long-fibre (DLF) composites can be made with randomly oriented unidirectional pre-impregnated composite chips. High fibre volume fraction chips provide good mechanical properties to the DLF architecture, which enables this material contribute bridging gap between continuous-fibre and randomly-oriented short-fibre composites. However, it is well known that fibres have highly anisotropic in-plane behaviour, causes weak points in parts when are at unfavourable angles. This...

Discontinuous-long-fibre (DLF) composites fabricated from pre-impregnated unidirectional (UD) fibre chips are susceptible to structural deficiency. The in-plane highly anisotropic mechanical properties of the combined with random nature orientation causes local weaknesses within material when fibres perpendicular load. Recent experimental results have shown that using woven-fibre could improve performance DLF by increasing their average and reducing variability. To better understand...

Elastic properties in critical areas of 3 D shells made from discontinuous long fibre (DLF) composites are difficult to determine via traditional methods, due the heterogeneity material and geometry part. In this paper, a method is proposed predict local modulus DLF based on micrograph polished edge specimen. The position orientation each extracted used conjunction with classical lamination theory elastic modulus. Fibre discontinuity accounted for by including correction factor Cox formula...

Magnetic resonance (MR) is a proven, nondestructive analytical technique in chemistry and medicine. The sensitivity of MR experiment principally dependent on the strength homogeneity polarizing static magnetic field, termed B <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> . This requirement has traditionally limited experiments to 'closed' configuration magnets or wires generating highly uniform , but limiting size sample that can be...

Abstract This study focuses on how catalyst concentration, activator and initial polymerization temperature impact in‐situ anionic ring‐opening (AROP) of ω‐lauryllactam. Catalyst roles are fulfilled by NaH toluene‐2,4‐diisocyanate (TDI), respectively, with varying catalyst/activator ratios to assess the influence a bifunctional process. The materials produced undergo thorough analysis, specific emphasis solidification time. examination extends scrutinizing different concentrations...

An experimental study was conducted to evaluate the flexural strength of restored wood piles strengthened with a glass fibre reinforced polymer (GFRP). Small-scale testing on matched samples mini landscape ties (3″ × 4″ 8′) treated preservative carried out. To represent restoration technique recently introduced pier in Atlantic Canada, sample first cut into an L shape at mid-length. The two pieces were spliced together and wrapped GFRP. Results show that had increase bending approximately...