Induced forming modes in a pre-consolidated woven polypropylene composite during stretch forming process at room temperature: I. Experimental studies

Zanjani, Nima Akhavan; Sexton, Anthony; Kalyanasundaram, Shankar

doi:10.1016/j.compositesa.2014.09.023

Cited by 17 publications

(6 citation statements)

References 24 publications

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“…The used aluminum alloy AA6082 is precipitation hardenable, which is excellent to anodize, corrosion resistant, and is often used in lightweight mass products such as automobiles. It has been shown that hybrid laminates with a thermoplastic matrix offer basic formability [13,14]. By heating above the melting temperature of the matrix, complex structures can be formed [15,16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Aluminum Surface Treatment on Tensile and Fatigue Behavior of Thermoplastic-Based Hybrid Laminates

et al. 2020

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Hybrid laminates consist of layers of different materials, which determine the mechanical properties of the laminate itself. Furthermore, the structure and interfacial properties between the layers play a key role regarding the performance under load and therefore need to be investigated in respect to industrial applicability. In this regard, a hybrid laminate comprised of AA6082 aluminum alloy sheets and glass and carbon fiber-reinforced thermoplastic (polyamide 6) is investigated in this study with a focus on the influence of aluminum surface treatment application on tensile and fatigue behavior. Four different aluminum surface treatments are discussed (adhesion promoter, mechanical blasting, phosphating, and anodizing), which were characterized by Laser Scanning Microscopy. After the thermal consolidation of the hybrid laminate under defined pressure, double notch shear tests and tensile tests were performed and correlated to determine the resulting interfacial strength between the aluminum sheet surface and the fiber-reinforced plastic, and its impact on tensile performance. To investigate the performance of the laminate under fatigue load in LCF and HCF regimes, a short-time procedure was applied consisting of resource-efficient instrumented multiple and constant amplitude tests. Digital image correlation, thermography, and hysteresis measurement methods were utilized to gain information about the aluminum surface treatment influence on fatigue damage initiation and development. The results show that fatigue-induced damage initiation, development, and mechanisms differ significantly depending on the applied aluminum surface treatment. The used measurement technologies proved to be suitable for this application and enabled correlations in between, showing that the hybrid laminates damage state, in particular regarding the interfacial bonding of the layers, can be monitored not just through visual recordings of local strain and temperature development, but also through stress-displacement hysteresis analysis.

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Section: Introductionmentioning

confidence: 99%

Influence of Aluminum Surface Treatment on Tensile and Fatigue Behavior of Thermoplastic-Based Hybrid Laminates

et al. 2020

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“…Zanjani, Sexton and Kalyanasundaram [1] revealed that an appropriate combination of fiber orientations and aspect ratios can enhance the formability of self-reinforced polypropylene (SRPP) in an open die stretch forming test. Wang et al [2] suggested a new Failure Limit Curve, which provides precise prediction on the onset of failure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fiber Orientation on the Wrinkling Behavior of Thermoplastic Composite

Chen

Kalyanasundaram

2017

MSF

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In this work, experiments were conducted to examine the impact of fiber orientation of self-reinforced polypropylene on wrinkling phenomenon. Defects due to wrinkling are major quality issues in rapid forming of sheet materials. This article examines the influence of two fiber orientations [0°/90° and 45°/-45°] on wrinkling initiation of a self-reinforced polypropylene composite (Curv®) material system. It was found that 45°/-45° specimen wrinkles at smaller axial displacement compared to 0°/90° specimen. In both specimens, there was an abrupt change in strain increment ratio that corresponded to the onset of wrinkling. This phenomenon validates the robustness of the wrinkling indictor based on strain increment ratio concept.

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“…In the forming limit curve (FLC) approach, the FLC is a line connecting limiting failure strains at each deformation mode in the forming limit diagram which is a plot of surface principal strains (major strain versus minor strain). This approach has proven to be an effective method in predicting the failure initiated in monolithic metal alloys [11,12], and the application of this method on thermoplastic woven composites has been trialled by Zanjani [13] who constructed a FLC for a preconsolidated selfreinforced polypropylene composite through stretching forming tests. Limiting major strains were expressed as a function of minor strain in this study, and the failure envelope created can be incorporated in FEA simulations through a userdefined damage model.…”

Section: Introductionmentioning

confidence: 99%

Investigating the forming limits of a flax fibre-reinforced polypropylene composite in different water treatment conditions

Wang

Lowe

Kalyanasundaram

2016

Int J Adv Manuf Technol

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The forming limits of natural fibre composite through stretch forming tests have been studied where hourglass samples of varying widths are formed using a hemispherical punch. This study proposes a new failure criterion which uses fibre strain and strain ratio. This new failure criterion is more effective than a conventional strain-based failure criterion in detecting failure in woven natural fibre composites as it can successfully eliminate the path dependency effect. This innovative method of examining failure can be applied to structural design of composite materials as long as their failure mechanisms are dominated by fibre fracture.

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Induced forming modes in a pre-consolidated woven polypropylene composite during stretch forming process at room temperature: I. Experimental studies

Cited by 17 publications

References 24 publications

Influence of Aluminum Surface Treatment on Tensile and Fatigue Behavior of Thermoplastic-Based Hybrid Laminates

Influence of Aluminum Surface Treatment on Tensile and Fatigue Behavior of Thermoplastic-Based Hybrid Laminates

Effect of Fiber Orientation on the Wrinkling Behavior of Thermoplastic Composite

Investigating the forming limits of a flax fibre-reinforced polypropylene composite in different water treatment conditions

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