%0 Thesis %1 citeulike:8020642 %A Karac, Aleksandar %D 2003 %K 76q05-hydro-and-aero-acoustics 76g25-general-aerodynamics-subsonic-flows 74f10-fluid-solid-interactions 74h45-vibrations %T Drop Impact of Fluid-Filled Polyethylene Containers %X The main aim of this study is to investigate the behaviour of water-filled blow-moulded high-density polyethylene containers under drop impact, and the mechanisms leading to their failure in order to predict when such failure will occur. To achieve this, a special drop impact rig is manufactured. Containers are dropped from different heights and deformation of the container wall and pressure in the fluid are recorded simultaneously using appropriate instrumentation. Due to limitations on the drop height, a rig is designed for impact tests on stationary containers. In addition, a set of standard tests for measuring critical drop height is conducted on different types of containers. In parallel with the experimental work, Finite Volume based numerical procedures for fluid-structure interaction problems are developed and validated. Two different strategies are used: one-system and two-system procedures. The two-system procedure is adopted for modelling the failure of fluid-filled plastic containers, due to its simplicity. Material properties, necessary for numerical simulations, are obtained fromvarious mechanical tests tensile properties are obtained from the standard tensile tests conducted at various rates, whereas the fracture properties, i.e. parameters of traction-separation low, are obtained using the Essential Work of Fracture tests. It has been found that the waterhammer theory describes the problem better than the mass-spring theory. The containers fail during the first pressure pulse caused by the impact at the weakest regions: the thinnest regions of the container wall and regions with stress concentrations, such as sudden change in the container thickness originating from the manufacturing process. The numerical procedures developed are proved to be capable of solving this complex fluid-structure-fracture problem. Numerical results are found to be in good agreement with experimental findings.

@phdthesis{citeulike:8020642, abstract = {{The main aim of this study is to investigate the behaviour of water-filled blow-moulded high-density polyethylene containers under drop impact, and the mechanisms leading to their failure in order to predict when such failure will occur. To achieve this, a special drop impact rig is manufactured. Containers are dropped from different heights and deformation of the container wall and pressure in the fluid are recorded simultaneously using appropriate instrumentation. Due to limitations on the drop height, a rig is designed for impact tests on stationary containers. In addition, a set of standard tests for measuring critical drop height is conducted on different types of containers. In parallel with the experimental work, Finite Volume based numerical procedures for fluid-structure interaction problems are developed and validated. Two different strategies are used: one-system and two-system procedures. The two-system procedure is adopted for modelling the failure of fluid-filled plastic containers, due to its simplicity. Material properties, necessary for numerical simulations, are obtained fromvarious mechanical tests tensile properties are obtained from the standard tensile tests conducted at various rates, whereas the fracture properties, i.e. parameters of traction-separation low, are obtained using the Essential Work of Fracture tests. It has been found that the waterhammer theory describes the problem better than the mass-spring theory. The containers fail during the first pressure pulse caused by the impact at the weakest regions: the thinnest regions of the container wall and regions with stress concentrations, such as sudden change in the container thickness originating from the manufacturing process. The numerical procedures developed are proved to be capable of solving this complex fluid-structure-fracture problem. Numerical results are found to be in good agreement with experimental findings.}}, added-at = {2017-06-29T07:13:07.000+0200}, author = {Karac, Aleksandar}, biburl = {https://www.bibsonomy.org/bibtex/2865c26ae08947611039abae719c0c143/gdmcbain}, citeulike-article-id = {8020642}, interhash = {2fb791a7c90cd70daa2c341e94641598}, intrahash = {865c26ae08947611039abae719c0c143}, keywords = {76q05-hydro-and-aero-acoustics 76g25-general-aerodynamics-subsonic-flows 74f10-fluid-solid-interactions 74h45-vibrations}, month = jun, posted-at = {2010-10-15 06:28:46}, priority = {2}, school = {Imperial College London}, timestamp = {2019-04-16T07:24:35.000+0200}, title = {{Drop Impact of Fluid-Filled Polyethylene Containers}}, year = 2003 }