While it's understandable that a windshield might crack when struck by a rock, flying debris, or some other impact, some cracks, known as stress cracks, suddenly appear for no apparent reason.
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How does a windshield crack without being hit?Stress crack
Stress cracks happen without any pressure being applied to the glass. It occurs due to a sudden and extreme change in temperature. A windshield expands in hot weather and contracts in cool weather, when the two happen constructively, a windshield can develop a stress crack.
Can a windshield crack by itself?
Windshields are made of glass and plastic components, so naturally, they can only withstand so much pressure. Too much pressure applied in any one area of the windshield's surface can be enough to cause cracks to form in or around that particular area.
What causes a windshield to just crack?
One of the most common causes of a cracked windshield is rocks and other hard objects that come flying at your windshield. Changes in temperature, heat from sunlight, and wind blowing heavy objects on the windshield can all cause it to crack. One more weather-related event that causes cracks in windshield is hail.
Why would my windshield crack for no reason?
Fluctuations in temperature, particularly if you use a defroster or even the car's heater, can cause the glass to expand and contract. Because the glass heats faster around the edges, these expansions and contractions occur at different rates, and this leads to cracking.
Temperature Changes – Extreme temperatures and sudden fluctuations from hot to cold can cause stress to the glass, resulting in a windshield crack. Be wary of the temperature in your area and use tactics such as slowly warming up your defroster as well as not parking in direct sunlight in order to prevent damage.
You may have heard tales of windshields or other auto glass suddenly cracking or even shattering. In truth, sudden breakage can occur, but it's not as spontaneous as you might think.
To clarify – your windshield will not really “spontaneously” shatter just from high heat or extreme cold. The process is more gradual than spontaneous. If you have a crack in your windshield that you do not have repaired and the seasons change you are at an increased risk of having your windshield spontaneously break.
Sometimes a car window can shatter almost spontaneously, such as when the vehicle door is closed particularly hard. While these incidents can seem inexplicable, a type of unaddressed damage is to blame.