English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Paper materials are natural composite materials and well-known to behydrophilic unless chemical and mechanical processing treatments areundertaken. The relative humidity impacts the fiber elasticity, the fiber-fiberbonds and the failure mechanism. In this work, we present a comprehensiveexperimental and computational study on the mechanical and failure behaviour ofthe fiber and the fiber network under humidity influence. The manuallyextracted cellulose fiber is exposed to different levels of humidity, and thenmechanically characterized using Atomic Force Microscopy, which delivers thehumidity dependent longitudinal Young's modulus. The obtained relationshipallows calculation of fiber elastic modulus at any humidity level. Moreover, byusing Confoncal Laser Scanning Microscopy, the coefficient of hygroscopicexpansion of the fibers is determined. On the other hand, we present a finiteelement model to simulate the deformation and the failure of the fiber network.The model includes the fiber anisotropy and the hygroscopic expansion using theexperimentally determined constants. In addition, it regards the fiber-fiberbonding and damage by using a humidity dependent cohesive zone interface model.Finite element simulations on exemplary fiber network samples are performed todemonstrate the influence of different aspects including relative humidity andfiber-fiber bonding parameters on the mechanical features such asforce-elongation curves, wet strength, extensiability and the local fiber-fiberdebonding. In meantime, fiber network failure in a locally wetted region isrevealed by tracking of individually stained fibers using in-situ imagingtechniques. Both the experimental data and the cohesive finite elementsimulations demonstrate the pull-out of fibers and imply the significant roleof the fiber-fiber debonding in the failure process of the wet paper.

Humidity Influence on Mechanics and Failure of Paper Materials: Joint Numerical and Experimental Study on Fiber and Fiber Network Scale