What are wood defects?

Wood defects are usually an abnormality or irregularity in the wood that arise from many different causes. For example, natural and acquired wood defects can be caused from insect and fungal attack, or rapid tree growth.

What is a defect in wood called?

Wood defects due to seasoning

More specific terms for warping include cupping, twisting, bowing, crook, and spring. Common seasoning defects, including types of warping, include: Bowing – A curvature formed in the direction of the length of timber. A bowed board is flat, but bent, like a road going over a hill.

How do you classify wood?

Wood can be broadly classified as Softwood and Hardwood. Density is a major determinant of the strength of wood. Hardwoods, being denser than the softwoods, are stronger and more durable. Softwood – It comes from the coniferous trees.

What are the main defects in timber?

Natural Defects in Timber. This group includes all those defects: (from an engineering point of view) that are developed in a tree during its growth. Their development, therefore, cannot be controlled by man. Most common natural defects are: knots, shakes, cross grain, crookedness, rind galls, burr, and curl.

What are the artificial defects of wood?

Artificial Defects: Artificial defects are those defects which occur during the conversion and seasoning of timber. They are caused by carelessness in handling timber by man. Artificial defects include the following: (a) Cup (b) bow (c) check (d) twist/warp (e) waney edge (f) insect attack.

What are the main defects in timber?

Natural Defects in Timber. This group includes all those defects: (from an engineering point of view) that are developed in a tree during its growth. Their development, therefore, cannot be controlled by man. Most common natural defects are: knots, shakes, cross grain, crookedness, rind galls, burr, and curl.

What are the common defects of timber?

The followings are the five main types of defects in timber:
  • Defects due to Natural Forces.
  • Defects due to Attack by Insects.
  • Defects due to Fungi.
  • Defects due to Defective Seasoning.
  • Defects due to Defective Conversion.

What are various types of defects in timber explain it?

Defects due to fungi

Sap stain: The sap wood looses its colour because of feed on cell contents of sap wood. Wet rot: Caused chemical decomposition of wood of the timber and timber converts to greyish brown powder known as wet rot. White rot: Attack lignin of wood and wood assumes the appearance of white mass.

What are two defects in timber?

A longitudinal crack that does not go through the whole log or plank; usually caused by too-rapid seasoning. Torn grain due to poor machining or finishing. A caved-in cell structure, caused during drying, giving a shrivelled or irregular appearance.

What is defect and types of defect?

Defects are defined as the deviation of the actual and expected result of system or software application. Defects can also be defined as any deviation or irregularity from the specifications mentioned in the product functional specification document. Defects are caused by the developer in development phase of software.

What is artificial defect of wood?

Artificial Defects: Artificial defects are those defects which occur during the conversion and seasoning of timber. They are caused by carelessness in handling timber by man. Artificial defects include the following: (a) Cup (b) bow (c) check (d) twist/warp (e) waney edge (f) insect attack.

What is Defect classification?

The third phase (defect classification) involves classifying the defects either during the inspection or online after the entire inspection process has been completed using several classification techniques which the system has been programmed with.

What are types of defects?

Common Types of Defects
  • Arithmetic Defects.
  • Logical Defects.
  • Syntax Defects.
  • Multithreading Defects.
  • Interface Defects.
  • Performance Defects.