1. P09045: Membrane Characterization Test Stand 7/5/2016 P09045: Membrane Characterization Test Stand 1 Detailed Customer Needs Customer Need #ImportanceDescriptionComments/Status CN1HighFunctional testing apparatus that meets project needs and thesis needs Accurately measure data / Data must be able to be correlated into stress/strain data that can be analyzed by ANSYS CN2HighSetup correlation for Test DataData correlation able to be analyzed using ANSYS. Based on literature review, there are applicable correlation models that will be used with current concept CN3HighMembrane test dataLoad/Displacement (Newtons/Millimeters)- This need is strictly to say we need load displacement data. As it has been discussed, the displacement is no longer measured by a motor encoder but will be measured using a high speed camera and labview software CN4HighVerification model via ANSYSShell model via ANSYS- This customer need is not necessarily something the senior design team must do but something the lead engineer can be able to do after for his thesis work. The need basically builds upon need 1,2, and 3

2. P09045: Membrane Characterization Test Stand 7/5/2016 P09045: Membrane Characterization Test Stand 2 Detailed Customer Needs Continued Customer Need #ImportanceDescriptionComments/Status CN5HighMinimize noise in measurement data Due to the low forces being used in the test stand, each step will have few mN of force and as a result, the accuracy of the measuring devices is very important. CN6HighEdge Effects EliminatedEdge effects will be eliminated by concentrating on a center potion of the test specimen CN7HighNew design including CAD drawings and BOM As a requirement for Week 8/9. These files will allow for a smooth transition into MSD II. CN8HighEasy repairIf machine breaks, minimize downtime CN9HighEasy to understand user manual

3. P09045: Membrane Characterization Test Stand 7/5/2016 P09045: Membrane Characterization Test Stand 3 Detailed Customer Needs Continued Customer Need #ImportanceDescriptionComments/Status CN102Low costMost parts are being reused from the old membrane indenter, minimizing costs CN112EfficientIncludes run time and making/mounting membrane to machine. Runtime includes the time each individual test takes, as a whole CN122Easy operationGoes along with efficiency, should be easy to set up and run a test CN132User friendly Labview interfaceCustomer needs to be able to have an easy GUI to use when operating test stand CN143Easy transportationTest stand might need transportation to an air table to minimize vibrations causing noise in the sample data. CN153Troubleshooting manual CN163Long life cyclePart replacement should be minimal

4. P09045: Membrane Characterization Test Stand Concept Selection 7/5/2016 P09045: Membrane Characterization Test Stand 4 Revision #:B Customer Need # ImportanceDescriptionMembrane Indenter BiaxialHemispherical Biaxial Volumetri c CN2HighSetup correlation for Test Data - Once load/displacement data is collected, a known correlation to apply data set to is necessary to be able to apply the information to ANSYS 0+0- CN3HighMembrane test data - Able to collect enough relavant load/displacement data that can be used later in a stress/strain correlation 0++0 CN5HighMinimize noise in measurement data - Sensitive measurement devices are important due to small load/displacements, including video analysis (high speed camera) 0000 CN6HighEdge Effects Eliminated - Edge effects need to be physically eliminated or some alternative proven approach must be used to avoid them 0000 CN7HighNew design including CAD drawings and BOM0000 CN8HighEasy repair - Along with life cycle, if one part does go down, the repairing of that part or replacement of that part should cause minimal down time 00--

5. P09045: Membrane Characterization Test Stand Concept Selection 7/5/2016 P09045: Membrane Characterization Test Stand 5 CN10MediumLow cost - cost includes all load cells, pressure sensors, motors, motor controllers and mechanical parts. 00-- CN11MediumEfficient - includes run time and making/mounting membrane to machine. Runtime includes the time each individual test takes, as a whole 0+-- CN12MediumEasy operation - Goes along with efficiency, should be easy to set up and run 0+-- CN13MediumUser friendly Labview interface - Customer needs to be able to have an easy GUI to use when operating test stand 0000 CN14LowEasy transportation - Test stand might need transportation to an air table to minimize vibrations causing noise in the sample data. 00-- CN16LowLong life cycle - Replacement of parts should be minimal 00-- Totals010-7-14

6. P09045: Membrane Characterization Test Stand 7/5/2016 P09045: Membrane Characterization Test Stand 6 Alternative Concepts  Biaxial Pressure System: Evenly apply a pressure Accurately measure the strain hard  Volumetric System: A similar machine exists Easy to expand balloon sample ANSYS correlation won’t work

7. P09045: Membrane Characterization Test Stand  Pulley System : Motor turns cable on pulleys Cable attached to clamps Clamps attached to sample As motor turns, sample stretches  Lead Screw System: Motor Turns two opposite threaded lead screws Moves aluminum blocks linearly Blocks attached to sample with piano wire  Biaxial Adapter Proven to work in Literature Applies ideas from both Pulley System and Lead Screw 7/5/2016 P09045: Membrane Characterization Test Stand 7 Concept Evolution

8. P09045: Membrane Characterization Test Stand 7/5/2016 P09045: Membrane Characterization Test Stand 8 Risk/Mitigation Plan Risk Item 1 Level 2 OwnerStatus and/or Contingency Plans Ordering electrical parts and having them calibrated (time) CriticalJamie Jackson Have one of two load cells. Took a little less than a week to receive this one. As long as they are in stock at Futek and Maxwell Bennett Associates isn’t backed up, we shouldn’t have a problem. Contingency Plan: Find another company with load cells or borrow from Dr. Day. Motor has been order by Anaheim Automation and was ordered to be used with the current motor controller. Have received motor and are satisfied with its abilities. Stress/Strain Correlation ((Functionality) CriticalJoseph Ferrara There has been a lot of literature research done. Multiple papers have shown different ways to quantify stress/strain. Must adapt their ideas to the machine we create. Tolerance of Clamping SystemCriticalJoseph Church Due to the small displacements and loads created by this system, when mounting the test specimen, the mounting device must all be identical in length to ensure equibiaxial tension. Ordering Mechanical Parts (Time) CriticalJoseph Ferrara Lead screws must be ordered. Depending on the company they are purchased from (McMaster-Carr or other) they must arrive in an applicable time frame. Contingency: Reuse the lead screws from the current membrane indenter. Bearings/Thompson Rods are all necessary to be ordered within spec so that the machine glides nicely. Nothing should be special order. Lead time should be minimum. Contingency: Find another online retailer.

9. P09045: Membrane Characterization Test Stand 7/5/2016 P09045: Membrane Characterization Test Stand 9 Risk/Mitigation Plan Wiring (electrical) organization (Performance/Quality) CriticalJamie Jackson As seen on the previous membrane indenter, the load cell wire can get caught in the lead screws and be mangled. Avoiding this on this design would be ideal. Clamping MethodCriticalJoseph Ferrara Mounting the sample with sutures could provide human error as far as the placement of multiple sutures on one side. Other option would be to make a clamping system. The clamping system could over constrain the membrane material. Plan: Test the two examples in ANSYS. Result: Central region deforms the same; edges are much more distorted with sutures. Lead Time for Labview CodingCriticalJoshua Van Hook Josh needs to be able to create a labview program that can run a motor and collect data from two load cells. Also must have code to trigger and take pictures with a high speed camera. Rework on the program is expected, however, rework must be minimized. Contingency: Professor Wellin is creating a program that uses a high speed camera and then takes the pictures from the camera and can measure displacement fields using a gridding pattern. MachiningCriticalJoseph Ferrara Tolerances and accuracy must be used in machining the equipment to make sure that everything glides smoothly and reduces friction to a minimum. Cycle TimeLowJoshua Van Hook Cycle time must be minimal but not overly important. Ideally, a test would be complete in one minute. Downtime/ReworkCriticalAllDowntime/Rework must be minimal. Project group is already a bit behind as far as the schedule. A broken machine would not be ideal nor would rework. We cannot afford to reorder any electrical parts either.