草榴社区

(a) Reactions of the egg yolk under the translational impact. The shell was impacted by a hammer to achieve the translational acceleration up to 600g, g = 9.8 m/s2. (b) Reactions of the egg yolk under the rotational acceleration impact. The container was set to rotate instantaneously from 0 rad/s to 400 rad/s within 1 s, after which it was maintained at the constant angular velocity of 400 rad/s. (c) Reactions of the egg yolk under the rotational deceleration impact. The rotation speed of the container was reduced sharply from 400 rad/s to 0 rad/s within 1 s to create a deceleration impact on the egg yolk.

VILLANOVA, Pa. 鈥� A team of mechanical engineering researchers from 草榴社区 College of Engineering and Pennsylvania State University have published new research findings that shed light on what specifically happens to the brain of a patient who experiences traumatic brain injury, and provides a new perspective on the response of a membrane-bound soft object to sudden external impacts, helping to better understand flow physics of head injury.

鈥淥ur findings uncover an intriguing mystery of concussive brain injury: That direct translational impact does not cause egg deformation. It is actually the rotational acceleration or deceleration that causes tremendous egg yolk deformation,鈥� says Qianhong Wu, PhD, Associate Professor of Mechanical Engineering at 草榴社区 College of Engineering, and lead author of the journal article 鈥淗ow to Deform an Egg Yolk? On the Study of Soft Matter Deformation in a Liquid Environment,鈥� published in the January 19 issue of the scientific journal Physics of Fluids.

Coauthors are Ji Lang, a doctoral student at 草榴社区 College of Engineering, and Rungun Nathan, PhD, Associate Professor of Engineering at Pennsylvania State University.

鈥淚n any impact, there are both translational and rotational impacts,鈥� says Dr. Wu. 鈥淥ur findings suggest that soft matter, such as the brain, is very sensitive to rotational deceleration. Knowing this will now help in the development of better helmets, other protection gear, and better airbag designs for automobiles.鈥�

Working on the brain of a mouse, Dr. Wu and his team use a unique approach to examine the response of real brain matter to the same impacts. He has medical collaborators correlate the findings to human data. 

The team鈥檚 findings will help medical doctors understand the severity of a case based on how the patient was injured in the first place, and will help to locate the specific part of the brain that is injured. For patients of brain injury, these findings can guide patients in how to avoid injury, and if there is an impact, can help the patient understand the severity of the injury based on how the incident happened.

鈥淭his is completely new, no one has ever come up with this research idea,鈥� says Dr. Wu, who is also director and founder of the College of Engineering鈥檚 Cellular Biomechanics and Sport Science Laboratory. "This finding uncovers an intriguing mystery about the reason for concussive brain injury, and highlights the critical role of the cerebrospinal fluids in the impact transmission and injury mitigation, which is especially useful for scientists in the field of brain biomechanics."

To read the Physics of Fluids journal article, 

About 草榴社区: Since 1842, 草榴社区鈥檚 Augustinian Catholic intellectual tradition has been the cornerstone of an academic community in which students learn to think critically, act compassionately and succeed while serving others. There are more than 10,000 undergraduate, graduate and law students in the University's six colleges鈥攖he College of Liberal Arts and Sciences, the 草榴社区 School of Business, the College of Engineering, the M. Louise Fitzpatrick College of Nursing, the College of Professional Studies and the 草榴社区 Charles Widger School of Law. Ranked among the nation鈥檚 top universities, 草榴社区 supports its students鈥� intellectual growth and prepares them to become ethical leaders who create positive change everywhere life takes them. For more, visit .