TY - JOUR

T1 - Femtosecond laser machining for characterization of local mechanical properties of biomaterials

T2 - a case study on wood

AU - Jakob, Severin

AU - Pfeifenberger, Manuel J.

AU - Hohenwarter, Anton

AU - Pippan, Reinhard

PY - 2017/8/22

Y1 - 2017/8/22

N2 - he standard preparation technique for micro-sized samples is focused ion beam milling, most frequently using Ga+ ions. The main drawbacks are the required processing time and the possibility and risks of ion implantation. In contrast, ultrashort pulsed laser ablation can process any type of material with ideally negligible damage to the surrounding volume and provides 4 to 6 orders of magnitude higher ablation rates than the ion beam technique. In this work, a femtosecond laser was used to prepare wood samples from spruce for mechanical testing at the micrometre level. After optimization of the different laser parameters, tensile and compressive specimens were produced from microtomed radial-tangential and longitudinal-tangential sections. Additionally, laser-processed samples were exposed to an electron beam prior to testing to study possible beam damage. The specimens originating from these different preparation conditions were mechanically tested. Advantages and limitations of the femtosecond laser preparation technique and the deformation and fracture behaviour of the samples are discussed. The results prove that femtosecond laser processing is a fast and precise preparation technique, which enables the fabrication of pristine biological samples with dimensions at the microscale.

AB - he standard preparation technique for micro-sized samples is focused ion beam milling, most frequently using Ga+ ions. The main drawbacks are the required processing time and the possibility and risks of ion implantation. In contrast, ultrashort pulsed laser ablation can process any type of material with ideally negligible damage to the surrounding volume and provides 4 to 6 orders of magnitude higher ablation rates than the ion beam technique. In this work, a femtosecond laser was used to prepare wood samples from spruce for mechanical testing at the micrometre level. After optimization of the different laser parameters, tensile and compressive specimens were produced from microtomed radial-tangential and longitudinal-tangential sections. Additionally, laser-processed samples were exposed to an electron beam prior to testing to study possible beam damage. The specimens originating from these different preparation conditions were mechanically tested. Advantages and limitations of the femtosecond laser preparation technique and the deformation and fracture behaviour of the samples are discussed. The results prove that femtosecond laser processing is a fast and precise preparation technique, which enables the fabrication of pristine biological samples with dimensions at the microscale.

KW - beam damage

KW - cell wall rupture

KW - cellular material

KW - femtosecond laser

KW - fibre debonding

KW - micromechanics

KW - sample preparation

KW - spruce

KW - Ultrashort pulse laser

KW - wood

UR - http://www.scopus.com/inward/record.url?scp=85028642802&partnerID=8YFLogxK

U2 - 10.1080/14686996.2017.1360751

DO - 10.1080/14686996.2017.1360751

M3 - Article

AN - SCOPUS:85028642802

VL - 18.2017

SP - 574

EP - 583

JO - Science and Technology of Advanced Materials

JF - Science and Technology of Advanced Materials

SN - 1468-6996

IS - 1

ER -