Browsing NTNU Open by Author "Lasn, Kaspar"

Accurate non-linear calculation model for decoupling thermal and mechanical loading effects in the OBR measurements

Wang, Shaoquan; Lasn, Kaspar (Peer reviewed; Journal article, 2021)

Fiber optic sensors are increasingly used in several fast-growing industries. Aerospace, energy storage, and the medical sector consider new implementations of optical fibers mainly for condition monitoring purposes. ...

ANN Analysis of DOFS Measurements Compromised by Mechanical and Acoustic Vibrations

Usenco, Valeria (Master thesis, 2022)

Distribuerte optisk-fiber sensorer (DOFS) blir stadig oftere anvendt til kontinuerlig situasjonsovervåkning av strukturer. Ny forskning har også undersøkt nye og innovative bruksområder til eksisterende nettverk med DOFS, ...

Comparison of DOFS attachment methods for time dependent strain sensing

Wang, Shaoquan; Sæter, Erik; Lasn, Kaspar (Peer reviewed; Journal article, 2021)

Structural health monitoring (SHM) is a challenge for many industries. Over the last decade, novel strain monitoring methods using optical fibers have been implemented for SHM in aerospace, energy storage, marine, and civil ...

Embedded optical fibres for monitoring pressurization and impact of filament wound cylinders

Sæter, Erik; Lasn, Kaspar; Echtermeyer, Andreas; Nony, Fabien (Journal article, 2018)

Filament wound composite pressure vessels have found use throughout many industries for storing high-pressure gases. The ability to investigate the vessels for possible damage from accidental impact loads is important for ...

EVALUATION OF STIFFNESS AND DAMAGE OF LAMINAR COMPOSITES

Lasn, Kaspar (Doctoral thesis at NTNU;2015:161, Doctoral thesis, 2015)

The elastic constants of laminated composites are required for modelling of structures or components made from these materials. The variability in manufacturing can result in different composite material properties than ...

Integration and performance of distributed optical fibre sensors in thermoplastics and thermoplastic composites

Wang, Shaoquan (Doctoral theses at NTNU;2023:129, Doctoral thesis, 2023)

Today, thermoplastics and fibre reinforced thermoplastic composites, are increasingly being used in all fields of commerce and industry, for their improved performance with respect to impact resistance, recyclability, and ...

Integration of optical fibre sensors by material extrusion 3-D printing – The effect of bottom interlayer thickness

Wang, Shaoquan; Lasn, Kaspar (Peer reviewed; Journal article, 2022)

Thermoplastic composites are becoming the materials of choice for lightweight structures. Distributed optical fibre sensors can be valuable for structural health monitoring of thermoplastic composites, improving safety ...

Long term material properties of pressure vessels made of composite material

Hugaas, Eivind (Doctoral theses at NTNU;2022:56, Doctoral thesis, 2022)

Pressure vessels are currently the limiting factor in the hydrogen distribution chain. The pressure vessels are preferably made out of composite materials to achieve practical weight to strength ratios and avoid hydrogen ...

Novel Impregnation System for Filament Winding

Mulelid, Mats (Master thesis, 2018)

A new enclosed impregnation system for the filament winding machine at NTNU has been designed and manufactured. The impregnation system concist of three main parts, the impregnation unit, resin reservoir and fixtures. The ...

Novel in-situ residual strain measurements in additive manufacturing specimens by using the Optical Backscatter Reflectometry

Wang, Shaoquan; Lasn, Kaspar; Elverum, Christer Westum; Wan, Di; Echtermeyer, Andreas (Journal article; Peer reviewed, 2020)

Material extrusion (MEX) is a well established production method in additive manufacturing. However, internal residual strains are accumulated during the layer-by-layer fabrication process. They bring about shape distortions ...