Reinforced thermosetting moulding compounds. Specification for sheet moulding compound (SMC) and bulk moulding compound (BMC)

2015 ◽  
Keyword(s):  
Moulding Compound ◽  
Sheet Moulding Compound

Predicting the surface waviness of sheet moulding compound parts by simulating process-induced thermal stresses

2011 ◽  
Vol 31 (8-9) ◽  
Author(s):  
Walter Michaeli ◽  
Christoph Kremer
Keyword(s):  
Thermal Stresses ◽  
Surface Defects ◽  
Computation Method ◽  
Surface Waviness ◽  
Curing Reaction ◽  
Calculated Stress ◽  
Moulding Compound ◽  
Different Types ◽  
Sheet Moulding Compound ◽  
Good Agreement

Abstract This paper describes an opportunity to compute the surface waviness of compression moulded sheet moulding compound (SMC) parts by simulating residual stresses. First, different types of surface defects occurring on SMC parts are discussed. A method for calculating the surface waviness of the compression moulded part is presented, which combines the simulation of the production process and the structural computation. Modelling of the curing reaction and the development of mechanical properties are discussed and implemented. The potential of the computation method is shown for an automotive fender made of SMC. The results state that the curing reaction of SMC can be well described using the approach of Ng and Manas-Zloczower. The position of the measured waviness on the examined fender is in good agreement with the calculated stress distribution.

GC-MS analysis of the liquid products obtained in the pyrolysis of fibre-glass polyester sheet moulding compound

2001 ◽  
Vol 58-59 ◽  
pp. 189-203 ◽  
Author(s):  
Amelia Torres ◽  
Isabel de Marco ◽  
Blanca M Caballero ◽  
M.Feli Laresgoiti ◽  
Miguel A Cabrero ◽  
...  
Keyword(s):  
Fibre Glass ◽  
Ms Analysis ◽  
Moulding Compound ◽  
Liquid Products ◽  
Sheet Moulding Compound

scholarly journals A thick-walled sheet moulding compound automotive component: Manufacturing and performance

2020 ◽  
Vol 128 ◽  
pp. 105688 ◽  
Author(s):  
L.M. Martulli ◽  
Thomas Creemers ◽  
Erich Schöberl ◽  
Nicholas Hale ◽  
Martin Kerschbaum ◽  
...  
Keyword(s):  
Automotive Component ◽  
Moulding Compound ◽  
Component Manufacturing ◽  
And Performance ◽  
Sheet Moulding Compound

Experimental investigations and optimization of processibility of sheet moulding compound

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Bhaskara J.C. Babu ◽  
Sachin Waigaonkar ◽  
Amit Rajput
Keyword(s):  
Penetration Depth ◽  
Flow Behavior ◽  
Glass Fibers ◽  
Zinc Stearate ◽  
Experimental Investigations ◽  
Compression Moulding ◽  
Maturation Time ◽  
Moulding Process ◽  
Moulding Compound ◽  
Sheet Moulding Compound

Abstract Sheet moulding compound (SMC) is a combination of glass fibers and filled polyester resin. It is processed by a compression moulding process and finds extensive applications in structural, automotive, electrical and electronic industries. The compression moulding process is characterized by the flow behavior of SMC under heat and pressure in the press mould. This paper is focused on the prediction of ideal processibility conditions of SMC. The qualitative aspect of a properly thickened (matured) moulding compound could be seen from its tack-free nature, which was quantitatively calibrated in terms of penetration depth, measured by a specially constructed softness indicator. The weight (wt)% of calcium carbonate (CaCO3) as filler, magnesium oxide (MgO) as thickener, graphite (C) and zinc stearate [Zn (C18H35O2)2] (ZnSt) as lubricants along with the maturation time (Tm) were selected as process variables. Taguchi’s scheme of experimental design was adapted to perform the experiments. It was found that the higher levels of MgO and CaCO3 were favorable for a good penetration depth as well as a reduced maturation time. We have also found that a penetration depth of at least 5 mm was required for achieving good processability conditions of SMC. An optimization study was under taken to find the right blend of additives and fillers, at their minimal weights and in the least possible maturation time, to achieve the desired processability. This study is particularly useful in a production run to make moulded parts from SMC.

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