Re: RP Strength Anisotropy Question

Date: Tue May 19 1998 - 19:51:10 EEST

I think Berndt Holmer at IVF in Sweden looked at anisotropy
in SLS polycarbonate parts a few years ago, and
concluded (if I remember right) that the modulus was broadly
unaffected by build orientation but that there was an
effect on ultimate strength (roughly what you'd expect).

We've been looking at the effect of build orientation on the
modulus/strength of DTM Rapidsteel parts (results will be
published at the Austin conference this year) if thats of interest.

Anybody know of any work looking at properties in shear or

Kenny Dalgarno

> From: John Kietzman <kietzman@leland.Stanford.EDU>
> Subject: RP Strength Anisotropy Question
> To:
> Date: Mon, 18 May 1998 10:16:18 -0700 (PDT)
> Cc: kietzman@leland.Stanford.EDU (John William Kietzman)

> Does anybody know of any measurements of orientation-dependent tensile
> strengths (or other mechanical properties) for commercial RP processes?
> The obvious experiment is building tensile specimens in the plane vs.
> making specimens vertically, in the build direction.
> I am familiar with the work by Gibson and Shi (commercial SLS machine)
> and Thompson (old SLS machine), but I'd be interested in other SLS
> work as well. I'd also really like to hear about any work in FDM or SLA
> (including fresh-from-the-machine vs. post-cured parts).
> Have any of the companies released data like this, or even been known
> to collect the data internally? Are any academics investigating this?
> Any pointers appreciated,
> John Kietzman
> Stanford University
> Rapid Prototyping Laboratory
> For more information about the rp-ml, see
Dr. K.W. Dalgarno, School of Mechanical Engineering,
University of Leeds, Leeds, LS2 9JT, UK.
Phone +44 (0)113 233 2234: Fax +44 (0)113 233 2150

For more information about the rp-ml, see

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