Mechanical properties of the cured laminates on the hot-press tackified preforms in vacuum assisted resin transfer molding

Abstract

A hot-press tackified preform was used to improve the uniformity of the laminates thickness and the mechanical properties of the obtained laminates were studied using vacuum assisted resin transfer molding (VARTM). Two modified preforms were prepared under 0.1 and 0.6 MPa in an autoclave and then were used to fabricate the laminates via VARTM. Permeability and thickness distribution of the laminates were obtained by using a special device. Moreover, the tensile and compressive strengths of the obtained laminates were studied and compared with the unmodified ones. Results show that the tackified laminates present a maximum and minimum thickness under 0.1 and 0.6 MPa, respectively. The thicknesses and in-plane permeability of the tackified laminates, with better thickness uniformity, are significantly decreased compared with that of the unmodified cases, while the tensile and compressive strengths of the tackified laminates are improved obviously. Results show that the mechanical property of the tackified laminates prepared by hotpressing at 0.1 MPa is better than that processed at 0.6 MPa.

Keywords

hot-press tackified preforms / thickness uniformity / mechanical property / permeability / VARTM

References

[1] Pillai K M. Modeling the Unsaturated Flow in Liquid Composite Molding Processes: A Review and Some Thoughts[J]. J. Compos. Mater., 2004, 38(23): 2097-2100.

[2] Mills A. Automation of Carbon Fiber Perform Manufacture for Affordable Aerospace Applications[J]. Composites Part A, 2001, 32(2): 955-958.

[3] Spoerre J, Zhang C, Wang H P, et al. Integrated Product and Process Design for Resin Transfer Molded Parts[J]. J. Compos. Mater., 1998, 32(13): 1244-1247.

[4] Acheson J A, Simacek P, Advani S G. The Implications of Fiber Compaction and Saturation on Fully Coupled VARTM Simulation[J]. Composites Part A, 2004, 35(2): 159-162.

[5] Yang J, Xiao J, Zeng J, et al. Compaction Behavior and Part Thickness Variation in Vacuum Infusion Molding Process[J]. Appl. Compos. Mater., 2014, 19: 443-446.

[6] Estrada G. Experimental Characterization of the Influence of Tackifier Material on Preform Permeability[J]. J. Compos. Mater., 2002, 19: 2297-2301.

[7] Anil K S, Dayal S M, Utpal K Niyogi. Effect of Tackifier and Cross-linkers on Electron Beam Curable Polyurethane Pressure Sensitive Adhesive[J]. Radiat. Phys. Chem., 2012, 81: 547-550.

[8] Roman W H, Brain S H, James C S. Tackifier/binder Toughened Resin Transfer Molding Composites[J]. J. Adv. Mater., 1999, 31(4): 52-56.

[9] Hillermeier R W, Hayes B S, Seferis J C. Processing of Highly Elastomeric Toughened Cyanate Esters Through a Modified Resin Transfer Molding Technique[J]. Polym. Compos., 1999, 20(1): 155-157.

[10] Depase E, Hayes B S, Seferis J C. Interlayer Toughening of VARTM Composites Effects of Tackifier Loading[C]. International SAMPE Symposium and Exhibition, 2002

[11] Rohatgi V, Lee L J. Moldability of Tackified Fiber Preforms in Liquid Composite Molding[J]. J. Compos. Mater., 1997, 31(7): 720-722.

[12] Shin C, Liu Q, Lee L James. Vacuum Assisted Resin Transfer Molding Using Tackified Fiber Preforms[J]. Polym. Compos., 2001, 22(6): 721-724.

[13] Wu y, Yi Xiaosu. Tackification of Textile Preforms for Resin Transfer Molding[J]. J. Guangdong Nonferrous Met., 2005, 15(2): 284-286.

[14] Wang C, Bai G, Wang Y, et al. Permeability Tests of Fiber Fabrics in the Vacuum Assisted Resin Transfer Molding Process[J]. Appl. Compos. Mater., 2015, 22: 363-367.