Design Guidelines for Additive Manufactured Snap-Fit Joints

Klahn, Christoph; Singer, Daniel; Meboldt, Mirko

doi:10.1016/j.procir.2016.04.130

Cited by 57 publications

(37 citation statements)

References 11 publications

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“…Thermal conductivity (k), specific heat capacity (Cp), and density (ρ) characterize the thermal diffusivity (α). Equations (11) to (14) summarize the relations between the influencing variables for calculating the melt front location. Based on the relations (11) to (14), a partial causal graph encoding this knowledge is constructed.…”

Section: _figure 8_mentioning

confidence: 99%

“…̇= . 2 (14) After extracting the influencing variables and the causal graph from the literature review [43], the equations of the problem are constructed using the dimensional analysis if an equation is not existing or by reusing existing equations. For example, equation (15) presents the dimensionless product for the melt front location.…”

Section: _figure 8_mentioning

confidence: 99%

“…ASTM released design guidelines [12] such as the ASTM WK38342 with a broad scope. Other publications are more case-specific [13], [14]. For instance, Klahn et al present guidelines for additively manufactured snap-fit joints [8].…”

Section: Introductionmentioning

confidence: 99%

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A Conceptual Design and Modeling Framework for Integrated Additive Manufacturing

Mokhtarian

Coatanéa

Paris

et al. 2018

Journal of Mechanical Design

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Modeling and simulation for additive manufacturing (AM) is commonly used in industry. Nevertheless, a central issue remaining is the integration of different models focusing on different objectives and targeting different levels of details. The objective of this work is to increase the prediction capability of characteristics and performances of additively manufactured parts and to co-design parts and processes. The paper contributes to this field of research by integrating part's performance model and additive technology process model into a single early integrated model. The paper uses the dimensional analysis conceptual modeling (DACM) framework in an AM perspective to generate causal graphs integrating the AM equipment and the part to be printed. DACM offers the possibility of integrating existing knowledge in the model. The framework supported by a computer tool produces a set of governing equations representing the relationships among the influencing variables of the integrated model. The systematic identification of the weaknesses and contradictions in the system and qualitative simulation of the system are some of the potential uses of the model. Ultimately, it is a way to create better designs of machines and parts, to control and qualify the manufacturing process, and to control three-dimensional (3D) printing processes. The DACM framework is tested on two cases of a 3D printer using the fused filament fabrication (FFF) powder bed fusion. The analysis, applied to the global system formed of the 3D printer and the part, illustrates the existence of contradictions. The analysis supports the early redesign of both parts and AM process (equipment) and later optimization of the control parameters.

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Section: _figure 8_mentioning

confidence: 99%

Section: _figure 8_mentioning

confidence: 99%

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A Conceptual Design and Modeling Framework for Integrated Additive Manufacturing

Mokhtarian

Coatanéa

Paris

et al. 2018

Journal of Mechanical Design

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“…In Klahna et al [37] design guidelines for Snap-Fit Joints were given. The restrictions of AM were driven mainly from the anisotropy of the mechanical properties and the staircase effect on the surface of AM parts.…”

Section: Size and Dimensionsmentioning

confidence: 99%

Design Consideration for Additive Manufacturing: Fused Deposition Modelling

Alafaghani¹,

Qattawi²,

Ablat³

2017

OJAppS

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Additive Manufacturing (AM) technologies have progressed in the past few years and many of them are now capable of producing functional parts instead of mere prototypes. AM provides a multitude of benefits, especially in design freedom. However, it still lacks industrial relevance because of the absence of comprehensive design rules for AM. Although AM is usually advertised as being the solution for all traditional manufacturing design limitations, the fact is that AM only replaces these limitations with a different set of restrictions. To fully exploit the advantages of AM, it is necessary to understand these limitations and consider them early during the design process. The establishment of design considerations in AM enables parts and process optimization. This paper discusses the design considerations that will lead to optimize part quality. Specifically, the work discusses the Fused Deposition Modeling (FDM) due to its common use and availability. These considerations are drawn from literature and from experiments done by the authors. The experiments done by the authors include an investigation for the influence of elevated service temperature on the performance of FDM PLA parts, benchmarking the capability of FDM to print overhangs and bridges without supports, studying the influence of processing parameters over dimensional accuracy, and the effect of processing parameters on the final FDM samples modulus of elasticity. The work presents a case study investigating the correct clearances for FDM parts and finally a redesign for AM case study of a support bracket originally manufactured using traditional manufacturing methods taking into consideration the design considerations discussed in this paper.

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“…The unit cells of the structural materials are designed based on a snap fit structure, which is a well‐established mechanical structure typically used as an important joining and assembling component in the manufacturing industry. The snap fit is basically comprised of two parts: a male plug and a mating female groove, where the size of the plug is slightly larger than the dimension of the mating female groove.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Stable Mechanical Structural Materials

et al. 2017

Adv Eng Mater

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Energy absorbing is an important and desirable property in mechanical and civil engineering. Here, a proof-of-concept method is presented as a new approach to achieve artificial mechanical materials with tunable compressive behavior for energy absorbing constructed from unit cells with a snap fit structure. The artificial structure undergoes a series of stable configurations derived from the sequential insertion of the plug into the groove of the snap fit. Both, experimental and simulation results manifest the multi-stable and tunable mechanical properties of the structure. The mechanical energy dissipated by the proposed structure is demonstrated to be dependent on the lead-in angle of the snap fit and the deflection ratio of the groove, as well as on the coefficient of friction between the plug and the groove of the snap fit. The system designed, herein, exhibits mechanical properties that can be tuned not only by adjusting the geometric parameters, but also by tuning the coefficient of friction between the plug and the groove, allowing the mechanical properties to be tailored post-fabrication. Furthermore, the proposed model can be extended to the macro-, micro-, or nanoscales. These findings provide a simple method to obtain artificial materials with tunable energy absorbing properties, which can be applied in areas such as the design of automobile bumpers and foldable devices that facilitate their transportation.

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Design Guidelines for Additive Manufactured Snap-Fit Joints

Cited by 57 publications

References 11 publications

A Conceptual Design and Modeling Framework for Integrated Additive Manufacturing

A Conceptual Design and Modeling Framework for Integrated Additive Manufacturing

Design Consideration for Additive Manufacturing: Fused Deposition Modelling

Multi‐Stable Mechanical Structural Materials

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