A synchrotron computed tomography dataset for validation of longitudinal tensile failure models based on fibre break and cluster development

We performed in-situ tensile tests on two carbon fibre/epoxy composites with continuous scanning using synchrotron computed tomography (CT). Both composites were cross-ply laminates, and two specimens were tested for each composite. The voxel size was sufficiently small to recognize individual fibres and fibre breaks. For each test, 16-19 volumes were reconstructed, cropped down to the 0° plies and analysed to track fibre break and cluster development. This dataset provides the last CT volume before failure for each of the four specimens as well as the individual fibre break locations in all reconstructed volumes. These data are then plotted against predictions from six state-of-the-art strength models. The target is that these data become a benchmark for the development of new models, inspiring researchers to set up refined experiments and develop improved models.

Delayed posttraumatic hemorrhage. "Spät-apoplexie"

BACKGROUND AND PURPOSE

Delayed posttraumatic hemorrhage (DPTH) is one of the causes of intracerebral hemorrhage (ICH). Most of the published series were reported before the advent of CT. Clinical characteristics and CT findings are described.

METHODS

Ten cases of CT-proven DPTH from a series of 216 patients (age range, 15 to 50 years) with ICH were evaluated. Previous CT scans performed in the first 6 hours after head injury were normal in all patients. Cerebral angiography showed no evidence of vascular disorders in any patient.

RESULTS

DPTH was the fourth most common cause of ICH in our series. The symptom-free interval after head injury ranged from 1 to 15 days. Most hematomas were located deep in the hemisphere and were of small or medium size. Clinical course was good in the majority of cases; none of the patients died, and there was no recurrence.

CONCLUSIONS

DPTH is a relatively frequent cause of ICH in young adults. There is no relationship with intensity of the previous head injury. The more frequent location deep in the hemisphere may be related to the younger age of our patients compared with those of other published series. The good outcome in our patients may be related to their youth and the absence of complications such as skull fracture, need for neurosurgery, or coagulation disorders.