CME 182 Engineering Design and Graphics CME 250 Statics CME 260 Mechanics of Materials CME 390 Composites Manufacturing CME 401 Engineering Economics CME 420 Manufacturing Systems Analysis CME 475 Design Project I CME 480 Design Project II
Office Hours D2L Brightspace Dept of Composite Materials Engineering
Professor Dennehy
Department of Composite Materials Engineering
Stark Hall 203F (507) 457-5276 kdennehy@winona.edu
CME 390 Composites Manufacturing
Description Information Objectives Calendar Requirements
Health and Safety Issues WSU Lab Safety and Handling of HazMat Environmental Regulations Hand Lay-up Spray-up Filament Winding Pultrusion RTM RIM Compression Molding Sandwich Composites Tooling Finishing Bonded Joint Mechanical Joint Ultrasonic Assembly Process Improvement Learning Curve
Teams Homework Problems Wet Lay-up Panel Bonded Joint Sandwich Panel Composite Processes Prototype Part

Homework Problems

Format Assignment Due Date
individual A small Minnesota shop fabricates some custom fiberglass parts using a spray-up process.  They do an excellent job of minimizing styrene vapor in the shop, but at the end of the day they place components of their spray equipment in a large container filled with methyl ethyl ketone, MEK, solvent (also known as 2-Butanone) and sometimes forget to cover the container.  The mornings following these days the workers arrive to 2 cubic feet of MEK vapor filling their 700 square feet (with 8-foot ceiling) shop.  They take out the components soaking in the MEK, finish cleaning them off, and then cover the container (preventing any further evaporation of the solvent).  By the end of the workday (8 hours later) all the MEK vapor is dissipated. Assuming a linear rate of decline in the MEK vapor concentration throughout the day:
Were the workers exposed to hazardous concentrations of MEK?
Were PELs exceeded in the shop?
Would PELs have been exceeded if the shop was located in Wisconsin?

Provide the calculations behind your answers.

 01/17
individual

Choose a process in which you play an integral role. It can be from your personal life, from where you work, or from school. Describe the current condition (steps in the process, times associated with each step, and the total time). Keeping in mind the seven sources of waste (DOTWIMP), describe the target condition (steps in the process, times associated with each step, and the total time). Indicate the types of waste eliminated. Write-up the information.

 04/22
individual

a). Based on past experience, what is the learning rate? (use the values for unit 1 and for unit 20 to determine the index of learning and then use that result to determine the learning rate)
b). What bid should LTI submit for the additional order of 100 units, assuming that learning continues?
c). What is the cost expected to be for the last unit under the learning rate you estimated?

04/24