Material specifications from manufacturers:
 

	Ultimate Tensile Strength (Mpa)	Elongation to Failure	Hardness	Mixed Viscosity (cPs)	Shrinkage (m/m)	Cure time before machining
ADTECH LUC-4180 polyurethane	55	15%	78-80D	800-900	.002	12hours
Ciba TDT 205-3 Polyurethane	23	9%	70D	80	.0022	2 hours
Innovative IE-50AC Polyurethane	4.08	470%	45-55 A	975	.001	24hours
Innovative IE-90A Polyurethane	17	450%	85-95A	975	.005	8hours
Innovative IE-65D Polyurethane	18.7	250%	50-60D	2000	.002	6hours
Innovative IE-70DC Polyurethane	28	60%	65-75D	1700	.002	10 hours
Adtech 501/503 Epoxy	42	1%	86-89D	3500	.000546	24 hours

Strength Test Performed by Rapid Prototyping Lab

Sample preparation

ASTM Type I dogbone tensile specimens are prepared: 13.0 mm X 57.0mm narrow section of 3.2 mm thickness, with 20mm-wide grip ends and a total length of 170 mm. Two types of specimens were tested: monolithic and dual-interface. The monolithic specimens are built horizontally within a single layer of material. The dual-interface specimens are built vertically, composed of more than one layers of material. For LUC-4180, the normal sample, the sample soaked in BIOACT 280 and the sample after grit blasting on interlayer were tested. The test results indicate that the grit blasting and chemical solvent improves the tensile strength of the dual-interface specimens.

Test results
 

	LUC-4180	LUC-4180 soaked in BIOACT 280	LUC-4180 grit blasted	TDT 205-3	501/530
Monolithic Speciments	58MPa	54Mpa	N/A	22Mpa	49MPa
Dual-Interface Specimens	4.6MPa	11Mpa	17Mpa	20Mpa	40MPa

Mechanical Test Scheduled on the Dynamic Test Machine Developed by Biomimetic Robotics Group

Dynamic test setup

Scheduled test

• Material characterization (loss modulus, storage modulus, etc.) for commonly used polyurathane materials
• Characterization for the robot leg with graded materials
• Tensile strength test for interlayer of multiple materials (polymer- polymer binding, polymer-metal binding, etc.)
• Shear strength test for sheet materials (used as a design reference for strain gage embedding)

Stay tuned for more experiment results …
 

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Last updated: 11/22/1999