CaseStudy#2The manufacture of a particular composite materialrequires mixing a percentage by weight of binder with resinto produce a gel. The gel is used to impregnate a fiber toproduce the composite material in a manual process calledthe lay-up. The strength, s, of the finished material dependson the percent binder in the gel. However, the strength mayalso be lay-up operator dependent.Formulate a test matrix by which the strength to percentbinder-gel ratio under production conditions can beestablished
Case Study #2 The manufacture of a particular composite material requires mixing a percentage by weight of binder with resin to produce a gel. The gel is used to impregnate a fiber to produce the composite material in a manual process called the lay-up. The strength, s, of the finished material depends on the percent binder in the gel. However, the strength may also be lay-up operator dependent. Formulate a test matrix by which the strength to percent binder–gel ratio under production conditions can be established
CaseStudy#3Suppose following lay-up, the composite material ofCase Study #2 is allowed to cure at a controlled butelevated temperature. We wish to develop a relationshipbetween the binder-gel ratio and the cure ttemperature and strength. Develop a suitable test matrix
Case Study #3 • Suppose following lay-up, the composite material of Case Study #2 is allowed to cure at a controlled but elevated temperature. We wish to develop a relationship between the binder–gel ratio and the cure t temperature and strength. Develop a suitable test matrix
ReplicationandRepetitionRepeated measurements made during any single test runor on a single batch are called repetitions.Repetition helps to quantify the variation in a measuredvariable as it occurs during any one test or batch whilethe operating conditions are held under nominal control.Replication allows us to assess the control of setting theoperating conditions, that is, the ability to reset theconditions to some desired value
Replication and Repetition • Repeated measurements made during any single test run or on a single batch are called repetitions. • Repetition helps to quantify the variation in a measured variable as it occurs during any one test or batch while the operating conditions are held under nominal control. • Replication allows us to assess the control of setting the operating conditions, that is, the ability to reset the conditions to some desired value
Example Consider a room furnace thermostat. Set to sometemperature, we can make repeated measurements(repetition) of room temperature and come to aconclusion about the average value and the variation inroom temperature at that particular thermostat setting
Example • Consider a room furnace thermostat. Set to some temperature, we can make repeated measurements (repetition) of room temperature and come to a conclusion about the average value and the variation in room temperature at that particular thermostat setting
CALIBRATIONA calibration applies a known input value to ameasurement system for the purpose of observing thesystem output value. It establishes the relationshipbetween the input and output values. The knownvalue used for the calibration is called the standard
CALIBRATION • A calibration applies a known input value to a measurement system for the purpose of observing the system output value. It establishes the relationship between the input and output values. The known value used for the calibration is called the standard