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<p><a href="/assets/courseware/v1/d5b1c00c3b77865f89b7e5926bc1ef49/asset-v1:MITx+16.885x+3T2019+type@asset+block/Lecture_6___Tom_Moser_-_Orbiter_Structures_and_Thermal_Protection_System.pdf" target="[object Object]">Lecture Slides</a></p>
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<h2 class="hd hd-2 unit-title">Orbiter Structures & Thermal Protection System: Part I</h2>
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<h2 class="hd hd-2 unit-title">Orbiter Structures & Thermal Protection System: Part II</h2>
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<h2 class="hd hd-2 unit-title">Orbiter Structures & Thermal Protection System: Part III</h2>
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<h2 class="hd hd-2 unit-title">Orbiter Structures & Thermal Protection System: Part IV</h2>
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<h2 class="hd hd-2 unit-title">Orbiter Structures & Thermal Protection System: Part V</h2>
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<legend id="7e5e4e496f124d34b37385246c51ae9f_2_1-legend" class="response-fieldset-legend field-group-hd">Which of the following reasons were responsible for making the Space Shuttle Orbiter body out of aluminum rather than out of titanium?</legend>
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><p>Despite its manufacturing difficulties, using a titanium structure would have significantly reduced the overall weight of the Space Shuttle Orbiter.</p>
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Question 3
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><p>Challenger was somewhat weaker structurally than the other orbiters because it was subjected to extra stress during its use as a structural test article.</p>
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Question 4
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_1675be82fd6845d2a9905149cf9ccb91_2_1">
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<legend id="1675be82fd6845d2a9905149cf9ccb91_2_1-legend" class="response-fieldset-legend field-group-hd">Why are the ceramic thermal protection tiles attached to strain isolation pads (SIP) rather than directly to the aluminum skin of the Space Shuttle?</legend>
<p class="question-description" id="description_1675be82fd6845d2a9905149cf9ccb91_1_1">Select all correct answers</p>
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<input type="checkbox" name="input_1675be82fd6845d2a9905149cf9ccb91_2_1[]" id="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="1675be82fd6845d2a9905149cf9ccb91_2_1-choice_0-label" for="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_1675be82fd6845d2a9905149cf9ccb91_2_1 description_1675be82fd6845d2a9905149cf9ccb91_1_1"> After the initial problems with tiles coming loose from the orbiter, it was realized that it was easier to bond to SIP than to aluminum.
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<input type="checkbox" name="input_1675be82fd6845d2a9905149cf9ccb91_2_1[]" id="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="1675be82fd6845d2a9905149cf9ccb91_2_1-choice_1-label" for="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_1675be82fd6845d2a9905149cf9ccb91_2_1 description_1675be82fd6845d2a9905149cf9ccb91_1_1"> The thermal expansion coefficient of aluminum is much greater than that of the ceramic tiles.
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<input type="checkbox" name="input_1675be82fd6845d2a9905149cf9ccb91_2_1[]" id="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="1675be82fd6845d2a9905149cf9ccb91_2_1-choice_2-label" for="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_1675be82fd6845d2a9905149cf9ccb91_2_1 description_1675be82fd6845d2a9905149cf9ccb91_1_1"> The SIP material provides extra thermal insulation, allowing the tiles to be thinner and lighter.
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<input type="checkbox" name="input_1675be82fd6845d2a9905149cf9ccb91_2_1[]" id="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_3" class="field-input input-checkbox" value="choice_3"/><label id="1675be82fd6845d2a9905149cf9ccb91_2_1-choice_3-label" for="input_1675be82fd6845d2a9905149cf9ccb91_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_1675be82fd6845d2a9905149cf9ccb91_2_1 description_1675be82fd6845d2a9905149cf9ccb91_1_1"> Small structural deformation in the orbiter&#8217;s aluminum skin would cause undue stress on the tiles.
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