Microstructural characterization of SLS-PA12 specimens under dynamic tension/compression excitation

Hooreweder, Brecht Van; Coninck, Filip De; Moens, David; Boonen, René; Sas, Paul

doi:10.1016/j.polymertesting.2009.12.006

Cited by 100 publications

(63 citation statements)

References 8 publications

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“…In previous work by the present authors, the influence of a dynamic tension/compression load on SLS-PA12 parts was analysed and related to the density, crystallinity, and microstructure of the material [3,4]. It was found that the material density is a crucial factor influencing the fatigue life.…”

Section: Introductionmentioning

confidence: 86%

“…The surface temperature of this sample stayed below the glass transition region for ±14000 cycles. Within this period, the specimen did not soften and the high mechanical load caused cracks to initiate from unmolten powder particles inside the sample, as explained in [3], and to propagate as indicated by the arrows in Figure 6A. Almost no signs of plastic deformation can be distinguished.…”

Section: Fatigue Behaviour Of Plain Specimensmentioning

confidence: 93%

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High cycle fatigue properties of selective laser sintered parts in polyamide 12

Hooreweder

Kruth

2014

CIRP Annals

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Selective laser sintered parts in polyamide are increasingly being used in functional applications. The monotonic properties of these parts are wellknown and documented. The cyclic material properties, on the other hand, are largely unknown. Therefore, in this paper a systematic analysis is made of fatigue properties and failure mechanisms of selective laser sintered parts subjected to fluctuating loading in tension/compression. Both plain and notched specimens are produced along perpendicular building directions. The fatigue behaviour of these parts is analysed and compared to injection moulded samples. In addition, the influence of the test frequency and the notch manufacturing method is studied.Additive Manufacturing, Selective Laser Sintering, Fatigue

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Section: Introductionmentioning

confidence: 86%

Section: Fatigue Behaviour Of Plain Specimensmentioning

confidence: 93%

High cycle fatigue properties of selective laser sintered parts in polyamide 12

Hooreweder

Kruth

2014

CIRP Annals

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“…In a study by Blattmeier et al [5] laser sintered specimens made of a polyamide powder (with 60% used and 40% virgin powder) with treated (with surface finishing) and non-treated surfaces were employed to examine surface influence on their fatigue behaviour in a load increase method. Van Hooreweder et al [6] subjected Nylon 12 laser sintered specimens to stress-controlled tension-compression fatigue loading with zero mean stress to investigate their thermal and microstructural response. Amel et al [7] investigated fatigue behaviour of LS Nylon 12 parts subject to displacementcontrolled tension only fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of section thickness on fatigue performance of laser sintered nylon 12

et al. 2016

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Laser Sintering offers manufacturers freedom of design, which enables creating parts with complex geometries. However, very little investigation has been made into the effects of geometry on mechanical properties of the parts. In the present study, Laser Sintered Nylon 12 parts with different section-thickness are subjected to displacement-controlled tension-tension and force-controlled fully-reversed fatigue loading to investigate the effect of geometry on their fatigue behaviour. Sectionthickness of the parts is shown to have no significant influence on the fatigue behaviour under tension-only loading. However, fatigue life of parts under fullyreversed loading is shown to increase with section thickness.

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“…An extensive literature exists describing the properties of parts produced by LS Bergman, 2000, 1997;Tontowi and Childs, 2001;Van Hooreweder et al, 2010;Vasinonta et al, 2000). Dressler et al (2010) described the temperature distribution in the powder bed during the LS process.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of polyamide 12 powder for use in laser sintering

Yuan

Diller

Bourell

et al. 2013

Rapid Prototyping Journal

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Purpose -The purpose of this paper is to acquire thermal conductivities of both fresh and preheated polyamide 12 powder under various conditions to provide a basis for effective and accurate control during the laser sintering (LS) process. Design/methodology/approach -A Hot Disk w TPS 500 thermal measurement system using a transient plane source (TPS) technology was employed for thermal conductivity measurements. Polyamide 12 powder was packed at different densities, and different carrier gases were used. Tests were also performed on fully dense laser sintered polyamide 12 to establish a baseline. Findings -Polyamide 12 powder thermal conductivity varies with packing density and temperature, which is approximately one-third bulk form thermal conductivity. Inter-particle bonding is the primary factor influencing polyamide 12 thermal conductivity. Research limitations/implications -Limited ranges of density were tested, and the carrier gas needed carefully control to prevent powder oxidation. Thermal properties obtained were not tested in the LS process. Originality/value -This experimental result could be used to enhance thermal control during the LS process.

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Microstructural characterization of SLS-PA12 specimens under dynamic tension/compression excitation

Cited by 100 publications

References 8 publications

High cycle fatigue properties of selective laser sintered parts in polyamide 12

High cycle fatigue properties of selective laser sintered parts in polyamide 12

Effect of section thickness on fatigue performance of laser sintered nylon 12

Thermal conductivity of polyamide 12 powder for use in laser sintering

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